Low level radio frequency control system for the European X-FEL
Author(s):
Stefan Simrock
Show Abstract
The requirements for RF Control Systems for the European XFEL are not only defined in terms of the stability of RF amplitude and phase but also with respect to operability, availability, and maintainability of the RF System. The field control of the vector-sum of many cavities driven by one klystron in pulsed mode at high gradients is a challenging task since Lorentz force detuning, mechanical vibrations (microphonics), and beam induced field errors must be suppressed by several orders of magnitude. This is accomplished by a combination of local and global feedback and feed-forward control.
Application of FPGA technology for control of superconducting TESLA cavities in free electron laser
Author(s):
Krzysztof T. Pozniak
Show Abstract
Contemporary fundamental research in physics, biology, chemistry, pharmacology, material technology and other uses frequently methods basing on collision of high energy particles or penetration of matter with ultra-short electromagnetic waves. Kinetic energy of involved particles, considerably greater than GeV, is generated in accelerators of unique construction. The paper presents a digest of working principles of accelerators. There are characterized research methods which use accelerators. A method to stabilize the accelerating EM field in superconducting (SC) resonant cavity was presented. An example was given of usage of TESLA cavities in linear accelerator propelling the FLASH free electron laser (FEL) in DESY, Hamburg. Electronic and photonic control system was debated. The system bases on advanced FPGA circuits and cooperating fast DSP microprocessor chips. Examples of practical solutions were described. Test results of the debated systems in the real-time conditions were given.
SIMCON 3.0 eight channel FPGA-based cavity simulator and controller for VUV free-electron laser
Author(s):
Krzysztof T. Pozniak;
Tomasz Czarski;
Waldemar Koprek;
Ryszard S. Romaniuk
Show Abstract
The work describes integrated system of hardware controller and simulator of superconductive cavity. The controller was realized on FPGA chip Xilinx-VirtexII-V4000. The solution uses DSP EMBEDDED BOARD positioned on a LLRF Modular Control Platform. The algorithm was realized in VHDL using hardware multiplication components existing in VirtexII series of chips. There was obtained implementation of a device working in real-time according to the control condition demands of LLRF system for TESLA superconductive cavities. The system is predicted as a developmental stage for FLASH accelerator and FEL laser and next for XFEL. The paper describes in detail functional layer, parameter programming, control basics for particular blocks, monitoring of real-time processes. There are presented results of system usage for control of the module ACC1 of FLASH laser.
Measurements of SIMCON 3.1 LLRF control signal processing quality for VUV free-electron laser FLASH
Author(s):
Rafal Pietrasik;
Wojciech Giergusiewicz;
Wojciech Jalmuzna;
Krzysztof T. Pozniak;
Ryszard S. Romaniuk;
Stefan Simrock
Show Abstract
The paper describes development of a new version of photonic and electronic control and measurement system for FLASH Laser under development in DESY Hamburg accelerator laboratory. The system is called SIMCON 3.1. and is a developmental continuation of previous systems SIMCON 1.0, SIMCON 2.1 and SIMCON 3.0. It differs from the
previous systems by considerably bigger resources: 10 fast analog input channels, bigger FPGA chip with two power PC - CPU units, two multi-gigabit optical links, GbE interface, booting possibility from flash memory card. The PCB is done in VME mechanical and electrical standard. It is designed for usage in tests for FLASH Laser development.
FPGA-based modular configurable controller with fast synchronous optical network
Author(s):
Rafal Graczyk;
Krzysztof T. Pozniak;
Ryszard S. Romaniuk
Show Abstract
The paper describes a configurable controller equipped with programmable VLSI FPGA circuit, universal expansion modules PMC, synchronous, optical, multi-gigabit links, commonly used industrial and computer communication interfaces, Ethernet 100TB, system of automatic initialization ACE etc. There are characterized the basic functional characteristics of the device. The possibilities of its usage in various work modes were presented. Realization of particular blocks of the device were discussed. Resulting, during the realization of this project, new hardware layer solutions were also characterized.
Synchronous optical transmission data link integrated with FPGA for TESLA FEL SIMCON system: long data vector optical transceiver module tests
Author(s):
Jerzy S. Zielinski;
Krzysztof T. Pozniak;
Ryszard S. Romaniuk
Show Abstract
The X-ray free-electron laser X-FEL that is being planned at the DESY research center in cooperation with European partners will produce high-intensity ultra-short X-ray flashes with the properties of laser light. This new light source, which can only be described in terms of superlatives, will open up a whole range of new possibilities for the natural sciences. It could also offer very promising opportunities for industrial users. SIMCON (SIMulator and CONtroller) is the project of the fast, low latency digital controller dedicated to the LLRF system in VUV FEL experiment. The main purpose of the project is to create a controller to stabilize the vector sum of fields in cavities of one cryo-module in the experiment. The device can be also used as the simulator of the cavity and test bench for other devices. The synchronic, optical link project was made for the accelerator X-FEL laser TESLA, the LLRF control system experiment at DESY, Hamburg. The control and diagnostic data is transmitted up to 2.5Gbit/s through a plastic fiber in a distance up to a few hundred meters. The link is synchronized once after power up, and never resynchronized when data is transmitted with maximum speed. The one way link bit error rate is less then 10-15. The transceiver component written in VHDL that works in the dedicated Altera® Stratix® GX FPGA circuit. During the work in the PERG laboratory a 2.5Gbit/s serial link with the long vector parallel interface transceiver was created. Long-Data-Vector transceiver transmits 16bit vector each 8ns with 120ns latency.
FPGA-based multichannel optical concentrator SIMCON 4.0 for TESLA cavities LLRF control system
Author(s):
Karol Perkuszewski;
Krzysztof T. Pozniak;
Wojciech Jalmuzna;
Waldemar Koprek;
Jaroslaw Szewinski;
Ryszard S. Romaniuk;
Stefan Simrock
Show Abstract
The paper presents an idea, design and realization of a gigabit, optoelectronic synchronous massive data concentrator for the LLRF control system for FLASH and XFEL superconducting accelerators and lasers. The design bases on a central, large, programmable FPGA VirtexIIPro circuit by Xilinx and on eight commercial optoelectronic transceivers. There were implemented peripheral devices for embedded PowerPC block like: memory and Ethernet. The SIMCON 4.0 module was realized as a single, standard EURO-6HE board with VXI/VME-bus. Hardware implementation was described for the most important functional blocks. Construction solutions were presented.
Control system modeling for superconducting accelerator
Author(s):
Tomasz Czarski;
Krzysztof Pozniak;
Ryszard Romaniuk;
Stefan Simrock
Show Abstract
A digital control of superconducting cavities for a linear accelerator is presented. The LLRF - Low Level Radio Frequency system for FLASH project in DESY is introduced. FPGA based controller supported by MATLAB system was developed to investigate the novel firmware implementation. Algebraic model in complex domain is proposed for the system analyzing. Calibration procedure of a signal path is considered for a multi-channel control. Identification of the system parameters is carried out by the least squares method application. Control tables: Feed-Forward and Set-Point are determined for the required cavity performance, according to the recognized process. Feedback loop is tuned by fitting a complex gain of a corrector unit. Adaptive control algorithm is applied for feed-forward and feedback modes. Experimental results are presented for a cavity representative operation.
DOOCS patterns: reusable software components for FPGA-based RF GUN field controller
Author(s):
Piotr Pucyk
Show Abstract
Modern accelerator technology combines software and hardware solutions to provide distributed, high efficiency digital systems for High Energy Physics experiments. Providing flexible, maintainable software is crucial for ensuring high availability of the whole system. In order to fulfill all these requirements, appropriate design and development techniques have to be used. Software patterns are well known solution for common programming issues, providing proven development paradigms, which can help to avoid many design issues. DOOCS patterns introduces new concepts of reusable software components for control system algorithms development and implementation in DOOCS framework. Chosen patterns have been described and usage examples have been presented in this paper.
Embedded system in FPGA-based LLRF controller for FLASH
Author(s):
Jaroslaw Szewinski;
Piotr Pucyk;
Wojciech Jalmuzna;
Przemyslaw Fafara;
Marcin Pieciukiewicz;
Ryszard Romaniuk;
Krzysztof T. Pozniak
Show Abstract
FPGA devices are often used in High Energy Physics and accelerator technology experiments, where the highest technologies are needed. To make FPGA based systems more flexible, common technique is to provide SoC (System on a Chip) solution in the FPGA, which is in most cases a CPU unit. Such a combination gives possibility to balance between hardware and software implementation of particular task. SoC solution on FPGA can be very flexible, because in simplest cases no additional hardware is needed to run programs on CPU, and when system has such devices like UART, SDRAM memory, mass storage and network interface, it can handle full featured operating system such as Linux or VxWorks. Embedded process can be set up in different configurations, depending on the available resources on board, so every user can adjust system to his own needs. Embedded systems can be also used to perform partial self-reconfiguration of FPGA logic of the chip, on which the system is running. This paper will also present some results on SoC implementations in a Low Level RF system under design for the VUV Free Electron Laser, FLASH, DESY, Hamburg.
Single bunch induced transient detection
Author(s):
P. Pawlik;
M. Grecki;
S. Simrock
Show Abstract
Single bunch induced transient detection is a new method for accelerating field amplitude and phase calibration in the particle accelerators. Amplitude calibration is a procedure which sets correct scaling factors for the downconverted signals. Phase calibration is used to set correct RF field phase with respect to the beam to get required acceleration. The old calibration method had disadvantages that are absent in a new method. The aim of this paper is to present the single bunch induced transient detection system and newly developed parts for it: feedforward comb filter with fine-tuning and variable gain amplifier.
Fault-tolerant VHDL descriptions: a case study for SEU-tolerant digital library
Author(s):
M. Tomczak;
B. Swiercz;
A. Napieralski
Show Abstract
This paper presents a new cost-effective method of designing Single Event Upset (SEU)-tolerant digital systems based on Commercial-Off-The-Shelf (COTS) Field-Programmable-Gate-Array (FPGA) devices. The project was carried out in cooperation of Technical University of Lodz (TUL) with Deutsches Elektronen-Synchrotron (DESY). DESY is a high-energy particle physics research centre, located in Hamburg, Germany, and has been chosen as a home site for a new generation particle collider - X-Ray Free Electron Laser (X-FEL) accelerator. A need of implementing digital control systems inside accelerators main tunnel, brought a new hardware approach to low-cost design reliable compex circuits with respect to Single Event Effects (SEEs). The goal was to develop a high performance method without modifications in the FPGA architecture and without high area penalties. A SEU-tolerant, digital library has been created. From basic gates, through combinational and sequential cells to some more sophisticated units like memory blocks, code converters or arithmetical functions cells, in all elements upset detection and mitigation schemes have been implemented. The library was described in Very High Speed Integrated Circuit Hardware Description Language (VHDL).
Application of RadFET for dosimetry of ionizing radiation
Author(s):
Dariusz Makowski;
Mariusz Grecki;
Bhaskar Mukherjee;
Stefan Simrock;
Andrzej Napieralski
Show Abstract
Bremsstrahlung gamma radiation and neutrons are produced during the operation of high-energy linear accelerators. A single circular tunnel is built for the X-ray Free Electron Laser (X-FEL), therefore most of electronic devices used to control the machine are going to be placed in the same vault as the main beam pipe. Therefore, the devices will be subjected to neutron and gamma radiation influence. Knowledge of neutron and gamma doses are crucial to understand and interpret radiation effects on electronic devices and systems dedicated to the operation in the environment of high-energy linear accelerators. Indeed, it is advisable to monitor radiation produced in the tunnel of X-FEL in real time to estimate the danger and the life-time of electronic components and devices. The realtime monitoring system dedicated to measure radiation produced in a linear accelerator tunnel was designed. The system utilizes two different types of detectors to gauge neutron fluence and gamma radiation dose during the operation of the accelerator driving X-FEL. Research described in this paper is focused on real time gamma radiation dosimetry. Silicon-based gamma-sensitive dosimeter RadFET was employed to quantify radiation produced during an operation of a linear accelerator. In order to fully investigate the feasibility of RadFET detector for gamma dosimetry various experiments and gamma radiation exposure tests were carried out using a cesium source and inside FLASH (Free Electron Laser At Hamburg) facility placed in a high-energy Research Centre DESY.
Beam intensity measurement system for proton synchrotron booster
Author(s):
David Belohrad;
Grzegorz Kasprowicz
Show Abstract
The PS Booster delivers particles for most of the CERN experiments. The PS complex will become particle source for LHC in 2007. For this reason PS complex electronics is continuously upgraded to meet new requirements in performance and remote management. A new acquisition system has been developed to allow the measurement of the individual intensity of each bunch in a 1Hz bunch train. Such a system will be used for the measurement of beams at the injection, ejection and acceleration lines . The method is based on integrating of the analogue signal supplied by a Beam Current Transformer. The signal is sampled by two 12 bits ADCs with 20x oversampling. The output of ADC is then processed in FPGA, where the rest of the signal processing is performed. The measurement system was build as a standard VME module. Apart from that, on same board there were implemented current and charge calibrators.
Clock-efficient and maintainable implementation of complex state machines in VHDL
Author(s):
Wojciech M. Zabolotny
Show Abstract
This paper presents a nonstandard approach to describe the complex state machines in VHDL to obtain both good readability of the code and efficient operation. This new approach, called "variable driven flow control in sequential process" allows to avoid loss of clock cycles when complex decisions are to be taken, and simultaneously allows to keep the structure of the code clear and easy to maintain. A simple example has been presented, showing the idea and practical implementation of the proposed method. The code produced by the presented method is synthesizable, and the obtained parameters of resulting FPGA implementation (both speed and occupancy) are good.
Testing of application specific integrated circuit in LabVIEW environment
Author(s):
Piotr Maj
Show Abstract
The process of implementation of a new Application Specific Integrated Circuit (ASIC) consists of several stages like designing, production and testing. To verify, if the ASIC fulfills all project specifications, sets of special tests are necessary, especially in the case of new scientific experiments in physics, material science or biology. Nowadays mostly the PC computers with dedicated hardware can communicate with the ASIC and perform those tests. Every new ASIC requires it's own dedicated software that performs specific communication protocol and contains many characteristic functions to test the parameters of the ASIC. The time for testing the new ASIC can be significantly shorten if the program blocks are properly written, i.e. there is a possibility to change the functionality of those blocks instantly to make some additional tests. In this article, we show an example of testing a 64-channel ASIC called DEDIX, which is used for fast digital X-ray imaging applications. The ASIC has been fabricated in 0.35 μm CMOS technology. Using a special software developed in LabVIEW environment, we tested analogue parameters of the front-end channels (gain, noise, offsets), the parameters of digital to analogue converters as well as functionality and speed of digital blocks. We concentrate on these programming techniques, which considerably speed up the developing of dedicated software for testing the new ASIC.
Behaviour of Altera FPGA circuits working under non-standard conditions
Author(s):
Marcin Grajda
Show Abstract
The paper describes different types of behaviour of FPGA circuits working with non-standard conditions (e.g. low supply voltage). Project of experimental board and measurement system, which allows to drive FPGA with specific inputs signals, was presented. Some examples of malfunction FPGA circuits responses caused by non-standard conditions have been shown.
Modelling and synthesis of automata in HDLs
Author(s):
Sławomir Chmielewski;
Marek Węgrzyn
Show Abstract
In the paper digital modelling and synthesis of automata in Hardware Description Languages is described. There is presented different kinds of automata and methods of realization using languages like VHDL and Verilog. Basic models for control units are: Finite State Machine (FSM), Algorithmic State Machine (ASM) and Linked State Machine (LSM). FSM, ASM and LSM can be represented graphically, which would help a designer to visualize and design in a more efficient way. On the other hand, a designer needs a fast and direct way to convert the considered designs into Hardware Description Language (HDL) codes for simulation and analysis it for synthesis and implementation.
Status of the full scale Pi-of-the-Sky project
Author(s):
M. Cwiok;
J. Grygorczuk;
J. Juchniewicz;
L. Mankiewicz;
J. Mrowca-Ciułacz;
K. Nawrocki;
M. Sokolowski;
G. Wrochna
Show Abstract
"Pi of the Sky" is a project aimed for continuous monitoring of large part of the sky with CCD cameras. After successful tests of the prototype with two cameras we proceeded towards the final design. New mount holding four cameras has been designed and it is currently under construction.
Study of rapidly varying astrophysical objects with the Pi-of-the-Sky apparatus
Author(s):
M. Biskup;
M. Cwiok;
H. Czyrkowski;
R. Dabrowski;
W. Dominik;
G. Kasprowic;
K. Malek;
L. Mankiewicz;
M. Molak;
J. Mrowca-Ciulacz;
K. Nawrocki;
L. W. Piotrowski;
P. Sitek;
M. Sokolowski;
J. Uzycki;
G. Wrochna;
A. F. Zarnecki
Show Abstract
"Pi of the Sky" is a detector designed for search for optical flashes of the cosmic origin in the sky. Its primary goal is to look for optical afterglows associated with the gamma ray bursts (GRB), but it is also good to tool to study any kind of short timescale astrophysical phenomena. The apparatus consists of two arrays of 16 cameras each, which allow for simultaneous observation of big fraction of the sky. Due to on-line data analysis in the real time, it has self-triggering capability and can react to external triggers with negative time delay. The prototype with two cameras has been installed at Las Campanas (Chile) and was operational in period since June 2004 till August 2005 and upgraded in June 2006. Database for storing large amount of astronomical measurements was developed. The general idea of experiment, apparatus and data analysis in the experiment will be presented.
Search for cosmic rays from gamma ray bursts by MazePi project
Author(s):
Marcin Molak;
Jacek Szabelski;
Wiesław Tłaczała;
Tadeusz Wibig;
Grzegorz Wrochna
Show Abstract
The origin of the Gamma Ray Bursts and the Cosmic Rays (especially with energies exceeding 1018 eV) remain the greatest puzzles of Nature. This paper briefly describes the MazePi project searching for coincidences of high energy cosmic rays with GRB optical emission. It is based on the Roland Maze Project, which applies idea of using the ground level Extensive Air Shower (EAS) detector array to look for high energy particles associated with gamma ray burst (GRB), and the "Pi of the Sky" project, which is fully autonomous system for detection and analysis of optical flashes connected with GRB.
New low noise CCD cameras for Pi-of-the-Sky project
Author(s):
G. Kasprowicz;
H. Czyrkowski;
R. Dabrowski;
W. Dominik;
L. Mankiewicz;
K. Pozniak;
R. Romaniuk;
P. Sitek;
M. Sokolowski;
R. Sulej;
J. Uzycki;
G. Wrochna
Show Abstract
Modern research trends require observation of fainter and fainter astronomical objects on large areas of the sky. This implies usage of systems with high temporal and optical resolution with computer based data acquisition and processing. Therefore Charge Coupled Devices (CCD) became so popular. They offer quick picture conversion with much better quality than film based technologies. This work is theoretical and practical study of the CCD based picture acquisition system. The system was optimized for "Pi of The Sky" project. But it can be adapted to another professional astronomical researches. The work includes issue of picture conversion, signal acquisition, data transfer and mechanical construction of the device.
Image acquisition in the Pi-of-the-Sky project
Author(s):
M. Jegier;
K. Nawrocki;
K. Poźniak;
M. Sokołowski
Show Abstract
Modern astronomical image acquisition systems dedicated for sky surveys provide large amount of data in a single measurement session. During one session that lasts a few hours it is possible to get as much as 100 GB of data. This large amount of data needs to be transferred from camera and processed. This paper presents some aspects of image acquisition in a sky survey image acquisition system. It describes a dedicated USB linux driver for the first version of the "Pi of The Sky" CCD camera (later versions have also Ethernet interface) and the test program for the camera together with a driver-wrapper providing core device functionality. Finally, the paper contains description of an algorithm for matching several images based on image features, i.e. star positions and their brightness.
Limits on GRB early optical emission from Pi-of-the-Sky system
Author(s):
Lech Wiktor Piotrowski;
Lech Mankiewicz;
Marcin Sokołowski;
Grzegorz Wrochna;
Aleksander Filip Żarnecki
Show Abstract
There is currently no experiment running that can perform non-accidental observations of Gamma Ray Bursts (GRB) optical counterparts from their very beginning, not mentioning seconds before the GRB. The main reason is the time that even small telescopes need for moving to the burst coordinates after receiving a trigger from a satellite and the time of the trigger propagation itself. "π of the Sky" project overcomes this obstacle by introducing an array of CCD cameras aimed at simultaneous observations of large sky area - and thus the location of the GRB source during and even before the burst itself. The price for this solutions is, however, a lower magnitudo range, reaching only about 14m - 15m. In this paper we present a preliminary analysis, based on most of the currently available optical lightcurve measurements, indicating that a significant fraction of GRB optical counterparts should lie in this range.
Data transmission protocol for Pi-of-the-Sky cameras
Author(s):
J. Uzycki;
G. Kasprowicz;
M. Mankiewicz;
K. Nawrocki;
P. Sitek;
M. Sokolowski;
R. Sulej;
W. Tlaczala
Show Abstract
The large amount of data collected by the automatic astronomical cameras has to be transferred to the fast computers in a reliable way. The method chosen should ensure data streaming in both directions but in nonsymmetrical way. The Ethernet interface is very good choice because of its popularity and proven performance. However it requires TCP/IP stack implementation in devices like cameras for full compliance with existing network and operating systems. This paper describes NUDP protocol, which was made as supplement to standard UDP protocol and can be used as a simple-network protocol. The NUDP does not need TCP protocol implementation and makes it possible to run the Ethernet network with simple devices based on microcontroller and/or FPGA chips. The data transmission idea was created especially for the "Pi of the Sky" project.
Tools for Pi-of-the-Sky data exploration
Author(s):
Małgorzata Sawitus;
Jerzy Tyszkiewicz;
Lech Mankiewicz;
Grzegorz Wrochna
Show Abstract
The Pi of the Sky experiment searches for fast optical transients in the sky. Its data is stored in huge databases, which contain mainly astrophysical objects' data and measurement of their brightness over time. This paper describes an application that was designed to make analysis of this data more effective. User requirements and solution based on them will be presented. The main idea of this solution is based on creating forms describing database queries in XML files. Such approach guarantees that changing existing forms and creating new ones is a simple task.
Databases for the Pi-of-the-Sky experiment
Author(s):
Marek Biskup;
Lech Mankiewicz;
Marcin Sokołowski;
Grzegorz Wrochna
Show Abstract
This paper describes databases used in the Pi of the Sky experiment, particularly the databases of stars and observations. The Pi of the Sky experiment, located at Las Campanas Observatory in Chile searches for rapidly changing optical objects such as Gamma Ray Bursts (GRB). The system consists of two CCD cameras placed on paralactic mount and operated by a PC, equipped with dedicated software. The data acquired is reduced and mainly the brightness of stars is stored in the database. A web interface for the database has been created. It allows easy and quick access to the experiment's data and to other star catalogs, which are also included in our databases.
Technology and spectral properties of Bragg gratings written in the fiber taper region
Author(s):
Kazimierz Jedrzejewski;
Tadeusz Tenderenda
Show Abstract
In this paper we present the technology of Bragg grating inscription in tapered telecom fibers. The bibliography of the subject i.e. theories of tapered fibers, Bragg gratings and tapered fiber Bragg gratings as well as up to date experimental experience have been outlined. The applied technologies have been explained in the experimental part of this paper. The results of spectral characteristics of the fabricated tapered fiber Bragg gratings were also presented. Conclusions and further research prospects were given.
Long period gratings: technology and parameters
Author(s):
K. Czachor;
K. P. Jedrzejewski
Show Abstract
Long Period Gratings (LPGs) are essential components for many modern telecommunication and metrology systems. The main purpose of presented work was the preliminary test on fabrication of such structures using ultraviolet irradiation and point-by-point technique. The UV 244 nm 100 mW Coherent argon-ion frequency doubled laser was used in the experiments. Long period gratings of different fiber suppliers and for different writing condition were inscribed. Influence of periods values or structure lengths on attenuations bands and gratings strength were investigated. Significant parameters in relation to future sensing applications are temperature and strain sensitivity. We have investigated behavior of LPGs in temperature range of 25-100oC. Good temperature stability of long period gratings was observed by placing them in 100oC for few hours in the temperature chamber.
Strain and temperature sensor applications of fiber Bragg gratings
Author(s):
P. Chojnowski;
K. P. Jędrzejewski
Show Abstract
Sensing properties of fiber Bragg grating (FBG) strain and temperature sensors produced in optical fibers were investigated. Several Bragg gratings were made by the scanning phase mask method. The double frequency 244 nm 100 mW Coherent argon-ion laser was used. Standard telecom fibers were used in the experiment but it was necessary to hydrogenate them under the pressure of 120 bar before the UV illumination. Bragg gratings spectral transmission characteristics were measured, filter central wavelength and FWHM calculated. Gratings were stretched and their strain sensitivity determined. FBG was also attached to the surface of elastic bar. It was bended in the squeeze and stretch configurations. Fiber Bragg grating temperature response was investigated and its sensitivity was measured. The linear response of the Bragg wavelength shift was observed in all experiments. Temperature compensation reference sensor method was examined.
Behavior of a uniform fiber Bragg grating under impulsive strain
Author(s):
Aleksandra Sikora
Show Abstract
The article contains the analysis of influence of the length of a uniform fiber Bragg grating on the accuracy of transducing an impulsive strain. Using the matrix description of the grating, derived from the coupled mode theory, the waveforms were calculated of the power spectrum of the beam reflected by the grating, caused by the strain impulse propagating along it. On the basis of the introduced centroidal frequency of the grating, the mean square transducing error of the grating was calculated, as a function of the ratio of its length to the strain length, for rectangular, triangular, half-sinusoidal and trapezoidal strain impulses. This error was also calculated depending on full width at half maximum.
Nonlinear propagation of various shape ultrashort pulses in a linearly birefringent single mode optical fiber: numerical analysis
Author(s):
Cezary Kaczmarek
Show Abstract
The results of numerical calculations of propagation of ultrashort hyperbolic secant, Gaussian and super Gaussian pusles in a linearly birefringent single mode fiber with input the polarization angle θ=15° and θ=30° are presented. From the performed calculations it follows, that the threshold amplitude of the initial pulse Ath, after exceeding of which the soliton trapping effect occurs, depends on the shape of the initial pulse and is lowest for the hyperbolic secant pulse and highest for the super Gaussian pulse in the entire range of the birefringence parameter 0.1 < δ < 1.0, with the notion that values of Ath are slightly lower when the polarization angle θ=15°. The calculation results also indicate, that the threshold value of the birefringence parameter δth, which designates the qualitatively different regions of soliton trapping, is dependent on the shape of the initial pulse as well. The highest value of δth was evaluated for the hyperbolic secant pulse, the lowest - for the super Gaussian pulse. The values of δth are very similar for input polarization angles θ=15° and θ=30° for each pulse.
Applications of capillary optical fibers
Author(s):
Ryszard Romaniuk
Show Abstract
The paper updates and summarizes contemporary applications of capillary optical fibers. Some of these applications are straight consequence of the classical capillary properties and capillary devices like: rheometry, electrophoresis, column chromatography (gas and liquid). Some new applications are tightly connected with co-propagation (or counter-propagation) of micro-mass together with optical wave - evanescent or of considerable intensity. In the first case, the optical wave is propagated in a narrow (more and more frequently single-mode) optical ring core adjacent to the capillary hole. The optical propagation is purely refractive. In the second case, the intensity maximum of optical wave is on the capillary long axis, i.e. in the center of the hole. The optical propagation is purely photonic, i.e. in a Bragg waveguide (one dimensional photonic band-gap). The capillary hole is filled with vacuum or with propagated matter (gas, liquid, single atoms, continuous particle arrangement). Optical capillaries, filamentary and embedded, are turning to a fundamental component of nano- and micro-MOEMS.
Technology of soft-glass optical fiber capillaries
Author(s):
Ryszard S. Romaniuk;
Jan Dorosz
Show Abstract
The paper describes preform based technology of soft-glass optical fibers. The most important parameters of soft-glass optical capillary are: hole dimension, proportion between air and glass in the cross-section and optical energy focusing near the air-glass boundary. The paper shows how, using technological methods, one can obtain required values of these parameters. Soft-glass optical capillaries of high mechanical, optical and geometrical quality are used as photonic components of sensors, functional devices and MOEMS.
Mechanical properties of hollow optical fibers
Author(s):
Ryszard S. Romaniuk;
Jan Dorosz
Show Abstract
Optical fiber glass is a brittle material. Classical optical fibers and capillaries (hollow optical fibres) find their applications in optical communications and instrumental, sensory systems. The fibers have to fulfill there certain standards for mechanical performance and safety, like resistance to tensile strain, resistance to bending to some degree. The paper gathers certain rules of theoretical and practical design and measurements of mechanical resistance of optical fibers. In particular, mechanical strength of hollow optical fibers is debated for instrumental applications. The capillary optical fibers were pulled in the Department of Optical Radiation (KPO) of Bialystok Univ. of Technology.
Optical fiber capillaries in trunk telecommunications
Author(s):
Ryszard S. Romaniuk
Show Abstract
The subject of the paper are big hollow core (capillary) photonic optical fibers (HC-PCF) or photonic band gap optical fibers (PBG). There are considered potential applications of these fibers in trunk, single mode optical cable telecommunication systems as compared with classical erbium doped glass core fibers. There are discussed the following problems: the origins of optical fiber transmission channel information capacity confinements, hypothetical transmission channel parameters based on photonic capillary optical fiber, basic construction solutions for optical capillaries. The paper debates the perspectives of further development of optical capillaries for trunk telecommunications, and examples of research carried now in this domain.
Atom guiding in single mode optical fiber capillary
Author(s):
Ryszard S. Romaniuk;
Jan Dorosz
Show Abstract
A relatively new method of atomic DeBroglie wave transmission in a hollow single mode optical fiber is presented. A slightly blue-detuned, from the atomic resonance, optical evanescent wave in the ring core of the capillary optical fiber creates a potential barrier for co-propagating or counter-propagating DeBroglie wave. The applied optical wavelength, associated with the used atomic transitions, was in the range 1100-400nm. Excited, metastable atoms of chromium, rubidium, cesium, helium, alkalis, etc., were transmitted in the capillary optical fiber. Initially the transmission was multimode and then single mode, with increasing efficiency. There are considered initial application perspectives of this transmission technology of DeBroglie wave for building of coherent cold sources of atoms, atom interferometers, and devices of the inverse lithography, which may possibly compete with the short-wave photo-lithography. The paper is a tutorial and has a teaching and technology review character.
High power optical fiber capillaries
Author(s):
Ryszard S. Romaniuk
Show Abstract
Optical fiber glass capillaries, in a variety of solutions, initially classical (refractive or reflective), and now photonic (diffractive and interference), are able to transmit high levels of optical power - CW and pulsed. It stems from the fact that the optical IR power is carried nearly totally in the air, noble gas or vacuum, but not in solid glass. The level of optical nonlinear effects in air is approximately 1000 lower than in the fiber grade glass. The paper discusses: possible propagation mechanisms in optical capillaries and good/bad sides of these mechanisms for transmission of high optical power, optimal high power fiber capillary parameters, types of used materials. There are underlined existing technical confinements and obtained transmission results. The development tendencies of a new generation of optical fiber capillaries are presented.
Measurement of refractive index using capillary waveguide
Author(s):
Piotr Miluski;
Dominik Dorosz
Show Abstract
The properties of medium can be often determined using its refractive index. For example the concentration of solution or dosage of components in solution can be obtained using measuring of refractive index of liquid media. This paper presents the fabricate process and properties of double layer capillary waveguide sensor for measurement of refractive index of liquids. It also presents theoretical analysis and results of experiments using this sensor.
Ring-core optical fibre doped with neodymium
Author(s):
Dominik Dorosz
Show Abstract
Signal processing, device oriented, ring-index fibres have a unique capability of transmitting either quasi planar modes for large ring diameters or the second order mode in a quasi single-mode regime at lossy discrimination of the fundamental mode, for small ring diameters. Ring-index fibres can maintain single mode transmission for considerable values of normalized frequency for particular cases of the refractive index profile. Theoretically predicted features of ring-index fibres were confirmed experimentally on the samples manufactured by the author. The ring shape of doped rare earth core gives the possibility to stimulate luminescence from the inside of the fibre. In this paper the ring-core doped with Nd3+ ions fibre is reported. The analysis of dependences between parameters of the core on light propagation in ring-core optical fibres is presented. The ring core is made from silica glasses doped with Nd3+.
Operating conditions of dysprosium activated fluorozirconate fiber laser in the visible
Author(s):
M. Klimczak;
P. Witoński;
W. Żurawski;
R. Piramidowicz
Show Abstract
The paper is focused on numerical analysis of lasing in blue and yellow spectral range of a Dy:ZBLAN fiber laser system, working in a Fabry-Perot configuration. A mathematical model based on measured spectroscopic data, as well as fiber structural parameters is implemented and yielded results are confronted with available experimental data. A reasonable agreement is found despite relative simplicity of the proposed solution.
Pr-doped lead fluoroborate glasses
Author(s):
Joanna Pisarska;
Grażyna Dominiak-Dzik;
Witold Ryba-Romanowski;
Wojciech A. Pisarski
Show Abstract
Structural and optical behavior of Pr-doped lead fluoroborate glass has been investigated. Incorporation of PbF2 results in structural and optical changes around Pr3+ ions and surrounding ligands, which were analyzed using X-ray diffraction, Raman, IR and luminescence spectroscopy. Shift of spectral lines has been observed, when lead oxide is totally substituted by lead fluoride in glass composition. Luminescence corresponding to the 1D2 - 3H4 transition of Pr3+ ions has been detected. The peak luminescence wavelength is changed from 604 nm to 599 nm and linewidth decreases from 23.5 nm to 18 nm, whereas the infrared bands due to the B-O vibrations are shifted to lower frequency region.
Luminescence of thulium and praseodymium in the fluorindate glass ceramics
Author(s):
Elżbieta Augustyn;
Joanna Pisarska
Show Abstract
Heavy metal fluoride glasses of the following composition: 35.5InF3-16BaF2-20ZnF2-20SrF2-6GaF3-2NaF-0.5PrF3 (IZBSGN05Pr) and 35.5InF3-16BaF2-20ZnF2-20SrF2-6GaF3-2NaF-0.5TmF3 (IZBSGN05Tm) have been studied. Obtained fluoroindate glasses have been submitted to controlled crystallization. The crystallite size was determined by Scherrer equation and the Williamson-Hall analysis. In those studies X-ray diffraction (XRD) and luminescence measurements have been employed.
Selected glasses and glass-ceramics for NIR luminescence
Author(s):
Joanna Pisarska;
Wojciech A. Pisarski
Show Abstract
Selected oxyfluoride glasses and glass-ceramics have been investigated. NIR luminescence at 1.06 μm and 1.53 μm for Nd3+ and Er3+ ions in multicomponent oxyfluoride systems was registered, which correspond to the main 4F3/2 - 4I11/2 and 4I13/2 - 4I15/2 laser transitions, respectively. Influence of PbF2 concentration and heat treatment on NIR luminescence decay kinetics has been analyzed in detail.
Synthesis and spectral analysis of hyperbranched poly(ethers) containing carbazole or hydrazone groups
Author(s):
W. A. Pisarski;
A. Swinarew;
B. Morejko;
Z. Grobelny;
A. Stolarzewicz;
J. V. Gražulevičius;
V. Getautis
Show Abstract
Hyperbranched poly(ethers) containing carbazole or hydrazone groups have been synthesized and investigated using absorption and luminescence spectroscopy. Purple-blue and greenish-blue fluorescence has been recorded for both polymer systems in tetrahydrofuran solution. Their spectral properties strongly depend on the monomer to initiator ratio and the kind of end groups.
Physico-chemical properties of organically modified silicates' sol-gel layers for optical fibre sensors
Author(s):
Eliza Chodkowska;
Jan Rayss
Show Abstract
The paper concerns the investigation of modified silica gel materials applied in optical fibre sensors. These materials are products of a sol-gel process in which three kinds of alkoxysilanes undergo hydrolysis and condensation and may play a role of the matrices containing transducer's molecules in the active layer of the sensor. In the experiment presented below three different compositions comprising tetraethoxysilane (TEOS), methyltriethoxysilane (MTES) and phenyltriethoxysilane (PhTES) were used. The alkoxysilanes underwent hydrolysis and condensation and the obtained gels were investigated in order to determine their texture, strucuture, composition and chemical properties as far as the dependence of those characteristics on the hydrolysis time and the molar ratio of the ingredients in the initial sols. The methods employed in the experiment were: Atomic Force Microscopy (AFM) which delivered vital information about the gels' textures, contact angles' and surface charge's measurements serving to estimate chemical properties of the gels' surfaces, Nuclear Magnetic Resonance (NMR) which helped to evaluate the hydrolysis' rate and porosimetric measurements enabling a determination of BET surface area and average diametres of the pores. The results may occur important for improving the construction of optical fibre sensors in which organically modified silicates (ORMOSILs)-TEOS layes are used.
Preparation and characterization of NiN nanocrystals embedded in a carbonaceous matrix
Author(s):
Elżbieta Czerwosz;
Piotr Dłużewski;
Justyna Kęczkowska;
Mirosław Kozłowski;
Joanna Rymarczyk;
Małgorzata Suchańska
Show Abstract
The characterization NiN nanocrystals (N- number of atoms in a nanocrystal) embedded in carbonaceous matrices is presented. The physical vapor deposition method was used to prepare nanocrystals. Transmission electron microscopy (TEM), atomic force microscopy (AFM), chemical analysis methods and optical absorption spectroscopy have been used to study samples properties. A hypothetical structure of nanocrystals NiN (13
A new approach to photoacoustic measurements
Author(s):
Tomasz Borowski
Show Abstract
The paper presents selected aspects of free space photoacoustics. The photoacoustic cell used in most of photoacoustic measurements introduces some limitations in receiving photoacoustic signal, which cause partial loss of photoacoustic signal energy. Use of photoacoustic cell results in conversion of a part of acoustical energy into different dissipative phenomena and/or processes which intensity depend on quality and design of the photoacoustic cell. Free space photoacoustic method offers capability of examination of perfect photoacoustic phenomenon without any vessels or constrains resulting from existence of a photoacoustic cell. Free space photoacoustic method can be applied not only to qualitative detection of ultra low leakages but also to quantitative measurements.
Programmable filter for photoacoustic experiments
Author(s):
Tomasz Starecki;
Marcin Grajda
Show Abstract
The paper describes a design, test circuit and preliminary test results of a programmable filter dedicated to photoacoustic experiments. The filter was implemented as a state variable filter with independent digital control of top and bottom corner frequencies as well as quality factor. In order to perform frequency response measurements a dedicated miniature automatic measurement system was designed. The system was based on digital direct synthesis of the input sine wave and true-RMS detection of the output signal.
Aurometer: the fog and rain detector for visibility measurements
Author(s):
Krzysztof Holejko;
Roman Nowak;
Tomasz Czarnecki
Show Abstract
The paper contains the description of an instrument called Aurometer designed for measurements of visibility and precipitation. The instrument is based on forward scattering method. Some results of measurements are also given.
Polarization state analysis in optical coherence tomography
Author(s):
Marcin Strąkowski;
Jerzy Pluciński;
Maciej Maciejewski;
Bogdan B. Kosmowski
Show Abstract
Optical Coherence Tomography (OCT) is a novel optical measurement technique for high resolution, high sensitivity 2D and 3D visualization of material inner structure. With the aid of OCT one can analyze a wide range of biological and technical materials in non-contact and non-destructive way. In our research we concentrate on possibilities of using OCT systems for characterization of polarization properties of investigated materials. We present a short review of polarization sensitive OCT topologies and principle of polarization state measurement.
Dispersion compensation in optical coherence tomography
Author(s):
Maciej Maciejewski;
Marcin Strąkowski;
Jerzy Pluciński;
Bogdan B. Kosmowski
Show Abstract
Dispersion of optical elements and sample in optical coherence tomography (OCT) system introduce a wavelength dependent phase distortion to the light beam propagating in OCT system. This causes blurring of the image in high resolution OCT using broadband light sources. Also decreased resolution with the depth of a sample is observed. To avoid this, the overall dispersion of the system can be compensated using a dispersive material in the reference arm of a system. Unfortunately, the dispersion is changed in the system with the probing depth. Overcome to this problem is numerical dispersion compensation technique. Calculations can be made after the measurements have been taken to provide depth dependent compensation. Various techniques and their possibilities are presented.
Influence of numerical quantization on imaging quality in digital holography
Author(s):
M. J. Matczak;
L. Pyziak;
D. Borowicz
Show Abstract
The influence of bit-depth limitations in hologram quantization process in classical off-axis digital holography on the quality of reconstructed images, which are numerically derived by Fresnel transformation of the complex amplitude distribution in the CCD plane, has been investigated. It is shown that the standard deviation is independent on the object intensity level and it decreases together with the increase of the quantization bit depth. For the bit depth grater than 16, the deviation reaches plateau.
Automatic analysis of interferograms: the issue of phase shifter calibration
Author(s):
Bartosz Zielinski;
Krzysztof Patorski
Show Abstract
Regardless of the time passing by the Temporal Phase Shifting (TPS) method is still one of the most commonly used interferometric techniques of automatic interferogram data acquisition and analysis. It is known to be accurate and reliable. The main assumption of TPS is that a set of images acquired has a phase difference due to a perfectly implemented phase shift only. Several calibration algorithms used are modifications of the Carre algorithm. This paper focuses on the implementation and numerical analysis of the calibration algorithm proposed by Chen et al. It is based on seeking the maximum and minimum intensity values. This approach is less restrictive because it does not require any knowledge of the phase shifter performance or establishing a special phase distribution in an interferogram. Its overall robustness is expected to be better, especially in view of in situ calibration conducted before every measurement.
Influence of multimode fiber frequency response variations on subcarrier multiplexing
Author(s):
Lukasz Maksymiuk;
Grzegorz Stepniak
Show Abstract
In this paper the influence of environmental conditions on subcarrier multiplexing in multimode fibers (MMF) is investigated. Measurements of fiber's frequency response variations due to external stress imposed on the fiber are presented. On the basis of measurements numerical simulations of subcarrier modulated transmission are performed. Eye diagram and BER degradation with respect to a measured variation in the frequency response is investigated.
Modelling of the dispersion coefficient for the optical beamforming for phased array antennas
Author(s):
Krzysztof M. Madziar;
Jarosław Dawidczyk
Show Abstract
Phased array antennas have received an attention in radiolocation and radar technology due to the fact that there is no need for the physical movement of an antenna and a very fast angle shift of the beam is possible. The need for improving performance in such devices lead to use the optical beamforming. In order to design such system the usage of appropriate dispersion coefficient of time delay lines is required. This paper shows examples of such dispersion coefficient modeling together with possible and useful simplifications.
The proposition of reflectometric fibre optic load sensor
Author(s):
Michał Borecki;
Maria Bebłowska;
Paweł Wrzosek
Show Abstract
Fibre optic load sensor are gaining attention because of their immunity to electromagnetic and radio frequency interference, suitability for use at elevated temperatures, and intrinsically safe nature. Construction of load sensor for application in safety systems has been presented. The device consists of sensor's head and source and detector units. Designed sensor could be mounted in monitored place (e.g. under a floor) and controlled by PC unit or could be used as a portable device for a valuable object protection.
Optical fiber switch for sensor networks: design principles
Author(s):
M. Borecki;
J. Szmidt;
P. Wrzosek;
M. Beblowska
Show Abstract
Photonic cross-sections play a crucial role in transparent optical networks. Designs intended for telecommunication networks are already well known, whereas those intended for sensor networks are still at a preliminary stage of development. The present paper presents a design and a model of a switch suitable for sensor networks. The idea underlying the design is the use of optical fibers with cores of relatively large diameters. The paper describes the basic assumptions adopted in the design, and the reasoning conducted to find the optimum configuration of the 1x2 switch microsystem. i.e. the switching lattice and its driver. The lattice is constructed of a fiber positioning circuit and an actuator. A model of the switch head for polymer clad silica fibers is presented. The underlying idea consists of the use of an electromagnetic actuator with a magnetic thumb-lock. This design enables the switch to be manufactured in short series and permits decreasing the dimensions of the entire microsystem.
Flat light guiding plate with prismatic elements and polarization film at entry surface
Author(s):
Krzysztof Zaremba
Show Abstract
Application of the polarization film at the entry surface of the light guiding plate allows for construction of the luminarie emitting highly polarized luminous flux. The highest values of the polarization index were observed for the maximum luminous intensity directions, which is contrary to what is observed in lighting systems with no films applied. The aforementioned effect was achieved with technical measures which are practical and inexpensive.
Polymers for electrical connections in printed circuit boards
Author(s):
Ryszard Kisiel
Show Abstract
It is becoming more and more difficult for the conventional PCBs with mechanically drilled vias and plated through holes to meet the current packaging density requirements. To overcome these challenges, new manufacturing schemes for high density and high performance multilayer PCBs have been developed. The polymer materials play important role in finding the cheap solution. Polymer materials are used to make reliable vertical interconnects in substrates made by SBU (Sequential build-up) processes. The SBU technology with conductive paste filled microvias can achieve a connection density of up to 100 pads/cm2 while the conventional PTHs can reach only 20 pads/cm2. The polymer base materials can be used to replace solders in PCB assembly. The exploitation data obtained from own research, and connected with applying adhesives in inner connections into PCB as well as connected with component assembly on PCB were given.
Investigation of electromigration on printed circuit boards soldered with lead-free solder
Author(s):
K. Kiełbasiński;
J. Kalenik;
R. Kisiel
Show Abstract
The electromigration on printed circuit test boards after soldering process was under investigation. FR-4 laminate, that is the most popular laminate for printed circuit boards fabrication, with 35mm thick copper layer was used in the test. Six various solders were applied in this work, which differed with silver content from each other. Some solder contained lead and copper. For electromigration assessment two tests were performed: Surface Insulation Resistance Test and Water-Drop Test. Silver presence in the solder do not decreased insulation resistance of test printed circuit boards. This implies, that small silver content in a solder does not increase electromigration of solder material. The "Water drop" test showed, that silver addition decreases electrochemical migration in continuous water layer on printed circuit board surface.
Investigation of electroless tin deposition from acidic thiourea-type bath
Author(s):
A. Araźna;
J. Bieliński
Show Abstract
The constant tendency of miniaturization in electronic products and developments in surface assembly techniques creates requirement to prepare new techniques and processes also in the range of metallic coatings. An additional factor which influences the evolution of preservatives coatings technology is the necessity to adapt Polish law to European directive. From 1st July 2006 there will be an obligatory RoHS directive banning applying lead in electronics. Electroless tin deposition is one of an alternative for Sn/Pb lead free preservative films on copper surface in PCB technology. Electroless deposition of tin coatings on copper can be made in two ways: from an alkaline bath - the process disproportionation of Sn(II) compounds and from acidic bath contain complex compound such as thiourea - the displacement of copper by tin in Sn(II). Alkaline baths are not used in printed circuit board technology because it has destructive influence on resists. Besides acidic baths complex compounds contain additional stability solution composition which modify structure of obtained tin film. Quality and thickness tin layer are fundamental parameters which determine its protective character. The research test were done in thiourea-type electroless tin bath. The influence of different parameters on n rate of tin deposition and thickness of Sn coating were determined: temperature of the bath, Sn(II)-salt, thiourea and HCl concentration. Tin layers were depositioned on electrolytical copper foil. The thickness of Sn coating was determined by coulometry in 2M HCl. The rate deposition process depends mainly on the thiourea and HCl concentrations in solution. The temperature is also a very important parameter. The thickness of tin layer grows when the temperature increase. Although above 70°C appear undesirable thiourea decomposition. The results of the investigation show that further investigations are necessary for this solution.
Applying thin layer resistors in multilayer printed circuit boards
Author(s):
Janusz Borecki
Show Abstract
In the paper there are presented the theory and aspects of choosing of resistors construction and technology of embedding thin-layer resistors inside multilayer PCBs (Printed Circuit Boards). The two kind of Ohmega-Play® laminates (1R25/1 25Ω/□ and 1A100/1 100Ω/□) were investigated. The results of investigations of applying embedded resistors also are presented. The experiments were focused on achieving the resistances from typical row E12. The deviation of electrical resistance of manufactured resistors not exceed the ranges ± 8 % and -12 % to +2 % with using of RCM materials type 1R25/1 25Ω/□ and 1A100/1 100Ω/□ respectively. The presented results of investigations determine the first part of work made in PCB manufacturing field in Tele and Radio Research Institute.
The new helping hand in the technological process of the negative form production
Author(s):
Lukasz Zaniewski;
Anna Bialostocka
Show Abstract
The direct electroplanting makes many useless problems in the thermoplastic industry. One of these is an edge effects problem. The computer modeling helps to solve this problem. The direct influence of this problem's solution has electric field intension. It's involving dependence on potential distribution and current density distribution. The one from two different methods of the fluid's mixing is applied to analyze of fluid flow and concentration of ions. It shows how useful is the ability of solution's circulation and how it helps in the electrochemical covering technology.
The analysis of electric field intensity in contacts of making switch
Author(s):
S. Kulas;
Ł. Kolimas
Show Abstract
The environment of insulating system in which making switch functions is air and atmospheric pressure. Air is applied as isolation and as extinguisher. Insulating system applying air is characterized by the lowest electric strength to breakdown. Despite the fact that insulating system applying air and atmospheric pressure is characterized by the lowest electric strength to breakdown from among other dielectrics which are applied in insulating systems, it has also some advantages. The air is safe for surrounding, cheap and moreover it retains its physical properties even when the making switch works in low temperatures. The object of theoretical analysis of the area of insulating contact system is to assess a diversity of electric field in contact space. The aim of theoretical analysis is to find in making switch, areas which have the biggest sensitivity to breakdown and determine features which are particularly crucial as regards electric strength.
An overview of radio frequency identification (RFID) tags technology
Author(s):
Wojciech Falinski
Show Abstract
RFID (Radio Frequency Identification) is the technology of wireless identification of tagged products. It is one of the fastest developing technologies in electronic market and it is predicted to replace soon the barcodes which are in common usage in today's economy. There are several advantages of RFID tags over barcode. The main are reading without must of scanning the product and the possibility to keep much more information on chip of the tag. In the article there are introduced the possible applications of RFID technology. There are also presented the classification of the RFID tags and the difference between working frequency. It is introduced every steps of manufacturing RFID tags with focus on the technology aspects (technologies of producing antenna, attaching the chip and creation of electrical connection between antenna and chip). Tele and Radio Research Institute is now starting to realize the project of manufacturing the RFID tags antenna. There is presented our guideline of the project.
Jamming protection of spread spectrum RFID system
Author(s):
Gustaw Mazurek
Show Abstract
This paper presents a new transform-domain processing algorithm for rejection of narrowband interferences in RFID/DS-CDMA systems. The performance of the proposed algorithm has been verified via computer simulations. Implementation issues have been discussed. The algorithm can be implemented in the FPGA or DSP technology.
Emerging biometrics: EEG-based identity verification
Author(s):
Rafał Wardziński
Show Abstract
We show that the electroencephalogram (EEG) contains individual-specific information, which can be extracted and used for identity verification. We applied both linear (Auto Regressive) and nonlinear (Generalized Autoregressive Conditional Heteroskedasticity) models to 16 second frames of one channel EEG down-sampled to frequency 60 Hz. We used parameters of this model as the features and employed a Mahalanobis distance-based classifier for identity verification of individuals. The initial testing for 10 persons using measurements distributed over a long period of time reached 88% of correct verifications, showing the potential of our approach, as well as indicating that the results are time invariant.
Iris recognition with compact zero-crossing-based coding
Author(s):
Adam Czajka;
Przemek Strzelczyk
Show Abstract
We propose an iris recognition technique using transformation of the iris image into a binary sequence that represents zero-crossing points of the filtered image by way of Laplacian of Gaussians. Novel iris localization and occlusion detection methods are developed to transform the iris image into the sequence of 1D stripes. The proposed enrollment procedure includes an independent selection of iris stripes among a number of enrollment images to minimize the recognition errors. The eyeball spontaneous rotation is corrected at the verification stage. The methodology was tested with a local database of 180 different irises, revealing the EER (Equal Error Rate) at the level of 0.03%.
Online signature verification using dynamic time warping with positional coordinates
Author(s):
Joanna Putz-Leszczyska
Show Abstract
This paper gives a view of the signature verification approached through the dynamic time warping. Warping is performed in a subspace of the observation space to enhance the important differences between the tested signatures. Very good results were obtained for the alignment based only on the pen position data. The templates were created using 5 signatures of each person thus enabling to estimate the spreads of signature components and use them for threshold scaling. For 170 volunteers we obtained 1.86% false rejections with false acceptance rate of 1.04%. The algorithms have a cascade form, which simplifies and speeds up the calculations.
Support vector machine for hand geometry-based identity verification system
Author(s):
Łukasz Stasiak
Show Abstract
A new approach to classifying the hand geometry features for personal verification is presented. This paper attempts to improve the performance of hand geometry-based systems by applying the Support Vector Machine (SVM) to the template classification task. We also compare the SVM-based approach to vector distance-based and neural network-based approaches as well as to other systems described in the literature and to the popular commercial systems. The testing results show that our system is competitive to the other known solutions.
Assessment of fetal heart disorder by means of fetal magnetocardiography
Author(s):
Maria Łozińska;
Zbigniew Dunajski
Show Abstract
Fetal magnetocardiography is new method for investigations of electrical activity of the fetal heart. The idea and build
of system for magnetic signal registration is described. Two cases of premature atrial contraction and complete AV
block diagnosis by means of magnetic field recording system are described.
Portable device based on a microcontroller for measurement of TEWL factor
Author(s):
Marcin Bąk;
Grzegorz Tarapata;
Jerzy Weremczuk
Show Abstract
This paper describes design and construction of device for TransEpidermal Water Loss (TEWL) factor measurement. Principle of operation is based on humidity measurement of air flowing through the chamber applied to human's skin surface. Measured data is stored in an EEPROM memory and after finishing, the results can be transferred via RS-232 bus to computer. Special software was designed for data processing, visualization and saving on the PC computer. The goal of constructed device is to develop presented idea of TEWL measurement and compare with other well known methods.
Microcontroller-based portable device for seeds moisture measurements
Author(s):
Roman Iwaszko;
Grzegorz Tarapata;
Jerzy Weremczuk
Show Abstract
The paper describes construction of a new specialized hygrometer and dedicated applications for data acquisition and analyzing that can be used for seeds moisture measurements. To find the correlation between seeds water content and measurements results obtained from the device the weight method was applied. This paper shows preliminary results from tests of fully functional system allowing estimation in a very easy end fast way of the water content in germinating seeds without seeds destruction.
Data analysis in a computer operated diagnostic system for laryngological and dermatological disorders
Author(s):
Michał Kuls;
Daniel Paczesny;
Grzegorz Tarapata
Show Abstract
This article describing analyzing measurement data using a database based computer application. First some information is given on the data acquisition issues. There were some problems with synchronising the begining of the measurement and with disturbances during measurement. Then the parametrisation of the graphs is described. A brief information on what are the parameters and how are they calculated. And finally the statistical module of our computer application is presented. Some information is given on how the data is grouped and how the statistical parameters are calculated.
Wireless smart sensor interface
Author(s):
Krzysztof Płotczyk;
Jerzy Weremczuk
Show Abstract
Wireless interfaces are nowadays getting much more popular. They allow to get rid of all cables and problems related to them. Sensors often work in aggressive environment, so wireless communication is of great demand. The paper presents a simple interface we designed, based on a RFID technology with RF powering capability. A 40 MHz radio field is able to deliver enough energy to power simple analog and digital circuits. The circuit can be used to convert sensor signal into modulated load resulting frequency modulation.
Computer assisted uroflowmetry diagnostic system
Author(s):
Jarosław Makal;
Adam Idźkowski;
Wojciech Walendziuk
Show Abstract
In this paper an original uroflowmeter (called Adalbertus) has been presented. The device draws the flow chart and measures the parameters of urine flow. It is used in urological surgeries as an assistance in diagnosis of lower urinary track diseases like Benign Prostatic Hyperplasia (BPH). The measuring track and its main part - weight sensor have been described. Also the way of uncertainty calculation is mentioned. An example flow chart has been shown and the achieved results have been compared with a commercial product.
The distributed system for collecting and analysing selected medical data
Author(s):
Jarosław Makal;
Adam Idźkowski;
Wojciech Walendziuk;
Marcin Mirończuk
Show Abstract
In this paper the structure of a three-tiered distributed system for collecting and analysing medical examination data is presented. The idea of this work is to make an assistant tool for urologists to diagnose the lower urinary track diseases and their symptoms easier. The data (which are processed from the files made in the uroflowmeters - devices for measuring urine flow rate) are presented in web browser. It has been done with the use of PHP scripts which are accessed through Apache web server.
Enzyme optimization for next level molecular computing
Author(s):
Piotr Wąsiewicz;
Michal Malinowski;
Andrzej Plucienniczak
Show Abstract
The main concept of molecular computing depends on DNA self-assembly abilities and on modifying DNA with the help of enzymes during genetic operations. In the typical DNA computing a sequence of operations executed on DNA strings in parallel is called an algorithm, which is also determined by a model of DNA strings. This methodology is similar to the soft hardware specialized architecture driven here by heating, cooling and enzymes, especially polymerases used for copying strings. As it is described in this paper the polymerase Taq properties are changed by modifying its DNA sequence in such a way that polymerase side activities together with peptide chains, responsible for destroying amplified strings, are cut off. Thus, it introduces the next level of molecular computing. The genetic operation execution succession and the given molecule model with designed nucleotide sequences produce computation results and additionally they modify enzymes, which directly influence on the computation process. The information flow begins to circulate. Additionally, such optimized enzymes are more suitable for nanoconstruction, because they have only desired characteristics. The experiment was proposed to confirm the possibilities of the suggested implementation.
Web-based application for voice telediagnostics
Author(s):
Adam Lusawa;
Antoni Grzanka
Show Abstract
This paper presents a web-based system for distance acoustic investigation of human voice. The system is dedicated to diagnosis of speech disorders, and can also be used in evaluating voice rehabilitation results. The fundamental part of the paper contains an extensive description of the system for voice telediagnostics. The paper also presents a review of presently applied technologies and methods of voice transmission over the Internet.
Measurement system for thermal drift of propagation time in fast pulse circuits
Author(s):
Piotr Z. Wieczorek
Show Abstract
The paper presents a precise measurement system for the thermal drift of propagation delay in digital circuits. The design technique and essential units of system have been described. The method of short time estimation is also shown. Results of the time drift in popular bipolar and CMOS circuits are discussed. A brief explanation of significant drift of CMOS circuit delay has been shown.
Temperature compensation of step recovery diode in fast sampling circuits
Author(s):
Aleksander Burd;
Katarzyna Opalska
Show Abstract
The paper concerns temperature compensation of time delay in ultra fast sampling circuits, used in digital oscilloscopes of gigahertz bandwidth. The main source of thermal instability appears to be step recovery diode used for sampling pulses generation, so the effort was taken toward assuring invariance of its delay regardless of operating temperature. The idea was successfully tested in the proposed circuit for diode polarisation and compensation.
SRD-based multistage circuit for shaping picosecond pulses
Author(s):
Katarzyna Opalska;
Stefan Misiaszek
Show Abstract
The paper presents an idea together with its experimental realisation of shaping step pulses with picosecond transition time. Shaping circuit is built from several stages, each of them containing Step Recovery Diode (SRD). Time-domain measurement illustrate achieved results. Computer simulation is shown to be useful to predict circuit behaviour.
Shaping of steep-edged pulses with controlled width
Author(s):
Katarzyna Opalska;
Stefan Misiaszek
Show Abstract
The paper presents an idea together with its experimental realisation of shaping very fast pulses with controlled width. Shaping circuit is based on Step Recovery Diodes (SRD). Measurement results illustrate achieved results, while computer simulation delivers some guidelines for circuit design.
Low cost programmable pulse generator with very short rise/fall time
Author(s):
Tomasz Starecki;
Stefan Misiaszek
Show Abstract
The paper describes a design of a very short rise/fall time programmable pulse generator. The circuit is based on a Si-Ge comparator, resulting in the rise/fall time of 50 ps. Low component count makes the design relatively simple. As a result, in many applications the presented generator can be a low-cost alternative to sophisticated test and measurements equipment. Due to use of in-system-programmable microcontroller and RS-232 interface, firmware upgrades of the device are very easy, and the generator can be controlled by a PC computer and used in automated measurement applications.
Programmable pulse sequence generator with multiple output lines
Author(s):
Hubert Drabczyk
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This paper presents a novel concept of pulse sequence generator and its prototype as an electronic circuit testing laboratory tool. The generator has multiple output lines and is capable of using control data defining different pulse sequences to be given to the outputs. It is also possible to use different voltage levels in output signal and switch output lines for reading data from driven system. The pulse sequence generator can be used for runtime environment simulation, as hardware tester or auxiliary tool in new designs. Important design factors were to keep cost of the tool low and allow integration with other projects by using flexible architecture. The prototype was based on universal programmer with adjustable power supply, '51 microcontroller and Altera Cyclone chip. The generator communicates witch PC computer via RS232 port. Dedicated software was developed in the course of this project, to control the tool and data transmission. The prototype confirmed the possibility to create an inexpensive multipurpose laboratory tool for programming, testing and simulation of digital devices.
New class of highly efficient intelligent cyclic ADCs: backgrounds, methods of design, and testing
Author(s):
Anatoliy Platonov;
Konrad Jędrzejewski;
Łukasz Małkiewicz;
Jakub Jasnos
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The paper presents a brief survey of new results in the theory, modelling, implementation and testing of new class of high-efficient low-energy cyclic A/D converters (CADC) - "intelligent" cyclic ADC (IC ADC). There are discussed general principles of IC ADC functioning, analysis and design, Advantages of IC ADC over conventional CADC caused by transition to computing of the long-bit codes (estimates) of the input signal are explained. Special attention is paid to particularities and methods of modelling analysis and testing of IC ADC.
Studying of compression of chirp signals with small BT and non-zero initial frequency
Author(s):
W. Pogribny;
T. Leszczynski
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The worked out methods of improvement of a resolution of a matching filtration in time domain of the short broadband signals with the use of linear modulation of frequency (the so-called chirp signals) which product BT does not exceed 100 and initial frequency is between 0 and B are studied in this work. Influence of a smoothing window and non linear operations as well as an initial phase and a sampling rate of the short chirp signals on their compression have been investigated in order to significant increase a ratio of a main lobe to side lobes of convolutions. The best result of the compression occurs when at the same time there is used a rectangular window, the non linear operations on the convolutions and the found out optimal parameters of the short chirp signal.
The influence of motion parameters of automated guided vehicle on energy consumption
Author(s):
Marcin Kędzior
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This paper presented how motion parameters of vehicle influenced on energy consumption. The capacity of the source of energy in the vehicle is limited. There is relationship between motion parameters of vehicle and energy consumption. The best method to investigate this property is by computer simulation. Some chosen results of simulation are presented in this paper.
The synthesis of the linear model of the electrical circuit with an asynchronous slip-ring motor
Author(s):
Paweł Myszkowski;
Sławomir Kwiećkowski
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In presented paper the analysis and synthesis of the non-linear models of physical systems will be considered. The analysis of the non-linear system dynamics will be performed by means of the linear model obtained by the global linearization method. The outline procedure of synthesis of the non-linear system will be also presented.
Visualization of control process by means of Petri nets and database
Author(s):
Agnieszka Węgrzyn;
Iwona Jóźwiak
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In the paper a method of visualization of concurrent controllers is presented. The visualization process is the part of the distributed control system. Controllers are modeled using interpreted Petri net. Petri net are stored in a database. In database are stored some associated data with parts of Petri net, too. These data for visualization process are used. Petri net are specified by PNSF3 or extended PNML formats, which are XML models.
Backgrounds of two variable (2D) measurements of resistance increments by bridge cascade circuit
Author(s):
Zygmunt L. Warsza
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Backgrounds of twodimensional (2D) simultaneous measurements of resistance increments in four terminal (4T) circuits working as twoport are presented. Their equivalent scheme - X type twoport circuit, i.e. the four-arm bridge (4R) of variable resistances is given. A short description in terms of its impedance type equations and terminal parameters is put forward. Formulas of their jointed signals are found. Also 2D measurement of bridge arms' resistance increments in the two bridges cascade circuit is given. Example of the indirect measurement of two variables differently influencing these increments is discussed in detail. Summary and conclusions and references are included.
Prototyping of virtual photonic laboratory
Author(s):
K. Zieliński;
M. Klimczak;
M. Kaczkan;
P. Witoński;
R. Piramidowicz
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The scope of this work encompasses an introduction to the design, set-up and internet commissioning of a virtual laboratory dedicated to photonics research support. General fundaments, as well as technically oriented details are discussed in the perspective of establishing an international measurements platform, in framework of European Research Area in the field of optoelectronics and photonics.
Real-time virtual laboratory design for coherent optoelectronical processors for 2D, 3D objects' recognition
Author(s):
Lukasz Lemieszewski;
Evgeny Ochin
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The report presents methods of creating virtual laboratories for variable usage classes and also methods of applying synchronisation and optimal arrangement of weights in remote communication, with client and server role placement, using parametric designing method. Moreover, it presents the operation of a coherent optoelectronical processor used as a model of a virtual laboratory in communication over a local area network and the internet.
Cooperation and competition in business on example of Internet research of opto-electronic companies
Author(s):
Małgorzata Kaliczyńska
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Based on findings from earlier studies which showed that links to academic web sites contain important information, the following study examines the practicability of using co-link data to describe cooperation and competition in optoelec-tronic business. The analysis was based on 32 companies and organizations which were found in an issue of a specialist magazine. For the purpose of the research three search engines - Google, Yahoo! and MSN Search were used. Assuming that a number of co-links to a pair of Web sites is a measure of the similarity between the two companies, the study aims at search for the sets of companies that would be similar to one another. The method applied is the MDS - multidimensional scaling that allows to present results of the analysis on a 2D map.
Specific absorption rate computations with the use of parallel processing
Author(s):
Wojciech Walendziuk
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In the following paper the parallel algorithm of specific absorption rate distribution analysis is presented. It uses a decomposition of a space domain into "Slice" sub-areas. The parallel algorithm was equipped in the Specific Absorption Rate and Temperature Increases calculation modules. The final part of the paper also contains the results of the efficiency research made on heterogeneous cluster of PCs.
Management system of ELHEP cluster machine for FEL photonics design
Author(s):
Jacek Zysik;
Krzysztof Poźniak;
Ryszard Romaniuk
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A multipurpose, distributed MatLab calculations oriented, cluster machine was assembled in PERG/ELHEP laboratory at ISE/WUT. It is predicted mainly for advanced photonics and FPGA/DSP based systems design for Free Electron Laser. It will be used also for student projects for superconducting accelerator and FEL. Here we present one specific side of cluster design. For an intense, distributed daily work with the cluster, it is important to have a good interface and practical access to all machine resources. A complex management system was implemented in PERG laboratory. It helps all registered users to work using all necessary applications, communicate with other logged in people, check all the news and gather all necessary information about what is going on in the system, how it is utilized, etc. The system is also very practical for administrator purposes, it helps to keep controlling who is using the resources and for how long. It provides different privileges for different applications and many more. The system is introduced as a freeware, using open source code and can be modified by system operators or super-users who are interested in nonstandard system configuration.
SIP-CCME cooperation in multimedia VoIP network
Author(s):
Magdalena Grądkowska;
Piotr Popiel;
Katarzyna Sobańska
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VoIP is a fast-developing technology which allows making telephone calls using a data network like the Internet. VoIP converts the voice signal from the telephone into a digital signal that travels over the Internet and then converts it back at the other end so that speaking to anyone with a regular phone number is possible. VoIP may also enable the direct calls from a computer with the use of a conventional telephone or a microphone. Some services using VoIP may only allow you to call other people using the same VoIP service, but others may allow you to call anyone who has a telephone number. First condition is a broadband Internet connection for VoIP technology to work. There are two major advantages of VOIP: lower cost and increased functionality. In the paper the integration of two networks, one with a CCME based installation and the other with a full Asterisk/SIP voicemail deployment is presented. The goal was to allow dialing between VoIP's telephony from different networks and evaluate a quality of connection with the use of certain codecs.
Implementation of WWW server in SoPC
Author(s):
Michał Grobelny;
Marek Węgrzyn
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In this paper implementation of WWW server in SoPC (System-on-Programmable-Chip) is described. Reasons for implementing a WWW server in SoPC are explained. Moreover, the basis architecture of SoPC will be mentioned. The proposed system is divided into two parts. First part is software implemented for microprocessor, which consists of operating system, web server and additional functionalities. Second part is a control process that is implemented in FPGA structure. The software solution is based on the Nut/OS operating system and web server implemented in it. The dynamic reconfiguration is also discussed.
Approximation of HRPITS results for SI GaAs by large scale support vector machine algorithms
Author(s):
Stanisław Jankowski;
Konrad Wojdan;
Zbigniew Szymański;
Roman Kozłowski
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For the first time large-scale support vector machine algorithms are used to extraction defect parameters in semi-insulating (SI) GaAs from high resolution photoinduced transient spectroscopy experiment. By smart decomposition of the data set the SVNTorch algorithm enabled to obtain good approximation of analyzed correlation surface by a parsimonious model (with small number of support vector). The extracted parameters of deep level defect centers from SVM approximation are of good quality as compared to the reference data.
Diameter determination of a basalt filament by the diffraction pattern analysis
Author(s):
Aleksandra Belczyk;
Piotr Żurawski;
Andrzej Wasilewski;
Tomasz Więcek
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We present a diffractografic method for a measurement of basalt filament diameter. These measurements were performed for the basalt filaments with a diameter about 10μm. This method is based on a diffraction pattern observation using CCD camera connected to PC computer. A simple model is discussed to explain obtained experimental data.
An observation of D1[delta] state in 13C16O molecule by the perturbation phenomena
Author(s):
M. Czernecka;
J. Domin;
A. Goławska
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The observations of perturbations by D1Δ state in the fourth positive system of 13C16O molecule have been performed at v'=8 of A1Π state. Spectroscopic parameters were obtained in the way of a rotational analysis of bands. Perturbation locations were investigated also.