The areas of photonic sensors and their applications have expanded rapidly in recent years. Photonic sensors, especially fiber-optic sensors, are widely used for measurement of various physical and chemical parameters in many fields. Recent developments in fiber gratings, micro-structured optical fibers, specially-doped optical fibers, and planar waveguide devices, etc, provide great potential and solutions for a variety of sensing applications that conventional sensors cannot handle. This topical conference will provide an international forum for the most recent and interesting technical issues concerning photonic sensors and their applications, including novel sensor devices, advanced sensing methods and sensor systems, innovative sensor integration and multiplexing techniques, and new applications and field tests. There will be a number of invited talks presented by leading scientists in the field of photonic sensors. Papers focused on the following and related topics are welcome: ;
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Conference 11901

Advanced Sensor Systems and Applications XI

In person: 10 - 11 October 2021
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  • Opening Ceremony and Plenary Session I
  • 1: Biological and Chemical Sensors I
  • Plenary Session II
  • 2: Mechanical and Electrical Sensors
  • 3: Microstructure Sensors and Specialty Fibers
  • 4: Biological and Chemical Sensors II
  • Poster Session
  • 5: New Sensor Devices and Systems
  • 6: New Sensor Techniques and Applications
Opening Ceremony and Plenary Session I
In person / Livestream: 10 October 2021 • 09:00 - 12:00 China Standard Time
9:00: Opening Ceremony
9:20: Awards and Recognition

11900-501
Author(s): Rebecca R. Richards-Kortum, Director, Rice 360 Institute for Global Health Technologies (United States), Rice Univ. (United States)
In person / Livestream: 10 October 2021 • 09:30 - 10:10 China Standard Time
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This talk will examine the challenges of designing and translating new low-cost optical technologies to improve global health equity, drawing from examples to improve newborn survival in African hospitals, to improve early detection of cervical cancer for women in Texas and Latin America, and to improve point-of-care diagnosis of COVID-19. The talk will summarize lessons learned to increase the diversity of innovation teams, and to increase the impact and sustainability of the resulting innovations.
Tea/Coffee Break 10:10 - 10:40
11890-502
Author(s): Wentao Wang, State Key Lab. of High Field Laser Physics (China), CAS Ctr. for Excellence in Ultra-intense Laser Science (China), Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
In person: 10 October 2021 • 10:40 - 11:20 China Standard Time
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X-ray free-electron lasers can generate intense and coherent radiation at wavelengths down to the sub-ångström region and have become indispensable tools for applications in structural biology and chemistry, among other disciplines. Several X-ray free-electron laser facilities are in operation; however, their requirement for large, high-cost, state-of-the-art radio-frequency accelerators has led to great interest in the development of compact and economical accelerators. Laser-wakefield accelerators can sustain accelerating gradients more than three orders of magnitude higher than those of radio-frequency accelerators, and are regarded as an attractive option for driving compact X-ray free-electron lasers. However, the realization of such devices remains a challenge owing to the relatively poor quality of electron beams that are based on a laser-wakefield accelerator. After ten years of efforts, we present an experimental demonstration of undulator radiation amplification in the exponential-gain regime by using electron beams based on a laser-wakefield accelerator.
11893-503
Author(s): Rui Zhu, Peking Univ. (China)
In person: 10 October 2021 • 11:20 - 12:00 China Standard Time
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Perovskite solar cells have attracted tremendous attention in recent years due to the high device performance and the superior optoelectronic properties of perovskite materials. In this talk, I will give an introduction about the advances of perovskite solar cells. Then, I will present our efforts on improving the device performance and understanding the device physics of perovskite solar cells. In addition, I will also discuss the advantages of perovskite solar cells for space aircraft application. We have some preliminary efforts of sending the perovskite solar cells into near space. I will share our view about the exciting possibilities for perovskite solar cell technology.
Break
Lunch Break 12:00 - 13:30
Session 1: Biological and Chemical Sensors I
In person: 10 October 2021 • 13:30 - 14:30 China Standard Time
Session Chair: Junfeng Jiang, Tianjin Univ. (China)
11901-1
Author(s): Jiahua Yang, Xiaopeng Dong, Biao Yin, Xiamen Univ. (China)
On demand | Presented Live 10 October 2021
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Different from the previously reported cryogenic temperature measurement based on the fiber Bragg grating (FBG) sensor, we propose a novel cryogenic temperature measurement scheme with a fiber interferometric sensor. The proposed sensor is constructed by the extrinsic Fabry–Perot interferometer (EFPI) which is consisted of a ceramic ferrule, a copper sleeve and two fiber ends. Under the cryogenic surrounding, the cavity length of the EFPI will change with the thermal deformation of the copper sleeve. With liquid nitrogen, the surrounding temperature can be changed from 77K to room temperature, and as high as 2.246nm/K of the temperature sensitivity can be achieved at a temperature range from 113K-153K in the experiment, with a 12.38μm EFPI cavity. The proposed interferometric sensor will still have relatively high sensitivity at a temperature lower than 77K according to our numerical simulation, so, has good application prospect in cryogenic temperature environment.
11901-2
Author(s): Panpan Niu, Junfeng Jiang, Shuang Wang, Tong Wang, Yize Liu, Tiegen Liu, Tianjin Univ. (China)
On demand | Presented Live 10 October 2021
11901-5
Author(s): Jing Zhao, Mingwei Li, Qi Wang, Hongxia Zhang, Tiegen Liu, Dagong Jia, Tianjin Univ. (China)
On demand | Presented Live 10 October 2021
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Cardiovascular disease is a major risk to human health, which needs long-term monitoring for prevention and early diagnosis. Optical sensors present the advantage of immunity to electromagnetic field and high sensitivity, and have been growing in a variety of emerging medical applications to monitor human cardiac parameters. Most of the current optical sensors can only measure limited cardiovascular information such as the heart rate, therefore, the optics-based approach for cardiac electrophysiology has attracted the attention of more researchers. In this paper, we developed a method to evaluate the availability of our proposed anti-EMI optical sensor. The sensitivity of optical sensor based on electro-optic modulation can achieve 266.4μW/V and detect the electrocardiogram (ECG) by attached to the chest and edge of clavicle. A series of ECG signals over 1 hour were analyzed using proposed method, which is driven by the optimization of R-peak location, Lorenz plot and statistical corre
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Tea/Coffee Break 14:30 - 15:30
Plenary Session II
In person / Livestream: 10 October 2021 • 15:30 - 16:20 China Standard Time
15:30: Welcome and Introduction

Q&A period will follow after the talk
11905-504
Author(s): Peter L. Knight, Blackett Lab., Imperial College London (United Kingdom), UK National Quantum Technology Strategic Advisory Board for UKRI (United Kingdom)
In person / Livestream: 10 October 2021 • 15:35 - 16:05 China Standard Time
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The UK through a mix of government and industry funding has committed more than £1Bn over 10 years to a coordinated programme in quantum technology. Seven years into this programme I will describe here how we got there, and our goals for the future. The UK National Quantum Technology Programme has induced a step change in the UK’s capabilities for pushing forward a new sector in future information technologies. I describe how the programme arose and the activities it supported and influenced to deliver these new capabilities, building on a first phase almost £480M investment across several UK government agencies. The UK programme is now in its second phase, with a further substantial investment by UK government and global industries in the UK making a total of over £1Bn. I will describe our plans for ensuring the advanced quantum science and demonstrator platforms in imaging, sensing, communications and computing developed over the past seven years will drive the formation of the QT sector and embed quantum tech in a broad range of industries. References 1. “Blackett Review: The Quantum Age: technological opportunities.” Government Office for Science, Available: https://www.gov.uk/government/publications/quantum-technologies-blackett-review; https://uknqt.ukri.org/files/strategicintent2020/; Peter Knight and Ian Walmsley 2019 Quantum Sci. Technol. 4 040502
Break
Tea/Coffee Break 16:20 - 16:30
Session 2: Mechanical and Electrical Sensors
In person: 10 October 2021 • 16:30 - 17:45 China Standard Time
Session Chair: Huilian Ma, Zhejiang Univ. (China)
11901-6
Author(s): Yongguang Wang, Guochen Wang, Harbin Institute of Technology (China); Boya Zhang, Military Office of Rocket Armaments Dept. (China); Wei Gao, Zhuo Wang, Harbin Institute of Technology (China)
On demand | Presented Live 10 October 2021
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Three kinds of main fabrication errors of λ/4 wave plate are proposed and demonstrated in this paper. To reduce the errors above, an elliptical core polarization-maintaining fiber is used as the wave plate fiber. And we built a set of all-fiber λ/4 wave plate fabrication platform utilizing polarization analyzer and optical microscope. The excellent performance λ/4 wave plate (DOP﹥98%, PER﹤0.2dB) was obtained with the fabrication platform. Experimental results of DC current measurement and temperature test show that the measurement accuracy of prototype with the fabricated λ/4 wave plate is better than 0.2S, which verified that the analysis of fabrication error and optimization technique of λ/4 wave plate in this paper can improves the performance of FOCT effectively.
11901-7
Author(s): Yuxin Zhao, Guochen Wang, Harbin Institute of Technology (China); Boya Zhang, Military Office of Rocket Armaments Dept. (China); Fei Yu, Zhuo Wang, Harbin Institute of Technology (China)
On demand | Presented Live 10 October 2021
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In the field of weak current measurement, the traditional optical fiber sensor has some problems such as low sensitivity and non-linearity, which seriously affects the measurement accuracy. To solve this problem, a fiber optic weak current sensor using orbital angular momentum (OAM) beam is proposed in this paper. The special helical symmetric phase structure of the OAM is used to make the OAM beam form petal-like pattern, and the current value is extracted from the rotation angle of the petal pattern. The proposed sensor is suitable for weak current measurement and solves the problem of measurement non-linearity. It is also proved that it has great potential in high current measurement.
11901-8
Author(s): Weiqi Miao, Guochen Wang, Fei Yu, Harbin Institute of Technology (China)
On demand | Presented Live 10 October 2021
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When the dual 90-degree rotation splices in the resonant cavity is used to suppress the zero-bias drift caused by polarization noise, the asymmetry of the two 90-degree rotation splices will cause the Shupe effect. The mathematical model of the Shupe effect caused by the asymmetry of two 90-degree rotation splices is established and simulated in this paper. The simulation results show that the value of the Shupe effect is proportional to the asymmetric length of the two 90-degree rotation splices. The Shupe effect can be suppressed by reducing the asymmetric length and using temperature insulating materials.
11901-9
Author(s): Xiu He, Zengling Ran, Nan Wang, Zhaoyang Ding, Lupeng Gan, Mengke Yu, Zhengxi He, Dong Sun, Yunjiang Rao, Univ. of Electronic Science and Technology of China (China); Yachao Zhang, Shaanxi Binchang Dafosi Mining Co., Ltd. (China); Dongsheng Ye, Shanxi Coal Chenghe Mining Co., Ltd. (China)
On demand | Presented Live 10 October 2021
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A novel sensitivity-enhanced all-fiber Fabry-Perot high-pressure sensor consisting of a long gauge-length and a hard-core diaphragm is proposed and demonstrated. The hard-core diaphragm can effectively improve the pressure sensitivity of the sensor and eliminate the additional reflection of its outer surface. Theoretical and experimental results show that the pressure sensitivity of the sensor is increased to about 2 times when its diaphragm thickness is decreased from 5 mm to 11 μm. In addition, the pressure and temperature sensitivity of –342.6 pm/MPa and –2.8 pm/℃ are achieved, respectively, in the pressure range of 0~20 MPa and temperature range of 13.6~300 ℃. The proposed sensor could offer some excellent features such as good high-temperature stability, low-temperature pressure cross-sensitivity, low mechanical hysteresis, making it attractive for pressure measurement under harsh environments.
11901-10
Author(s): Timur M. Akhmadiev, Yrii V. Filatov, Egor V. Shalymov, Vladimir Y. Venediktov, Saint Petersburg Electrotechnical Univ. (Russian Federation); Anastasiia V. Venediktova, Saint Petersburg State Univ. (Russian Federation)
On demand
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Parity-time-symmetry systems are a new class of non-Hermitian systems with unique properties, based on the extension of the quantum-mechanical concept of parity-time-symmetry, with which research on this topic began, to optics, where today the practical implementation of parity-time-symmetry is possible. In optical parity-time-symmetry systems, at certain values of their parameters, a phase transition from the real eigenvalues of the Hamiltonian to the complex ones is observed. This phase transition, which can be directly or indirectly caused by a change in the measured physical quantity, leads to a sharp change in the optical properties of the system. This work is devoted to the analysis of the methods for measuring the angular velocity based on the use of optical parity-time-symmetry systems. A new method for measuring the angular velocity is also proposed, based on the use of a parity-time-symmetry system of two straight coupled waveguides with a passive resonator connected to it.
Session 3: Microstructure Sensors and Specialty Fibers
In person: 11 October 2021 • 09:00 - 10:00 China Standard Time
Session Chair: Liang Zhang, Shanghai Univ. (China)
11901-14
Author(s): Peng Zhang, Shuang Wang, Junfeng Jiang, Zhiyuan Li, Haokun Yang, Tiegen Liu, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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A metal diaphragm-based airflow sensor based on fiber-optic Fabry-Perot (F-P) interference has been proposed and experimentally demonstrated. The sensor is composed of glass sleeving, ceramic ferrule and metal diaphragm. Through data calibration, a practical airflow sensor has been fabricated. As a result of the stainless steel diaphragm and open F-P cavity, the durability of the sensor is ensured, and it can be used in poor air quality environments. Experimental results in the airflow field show that the sensor has the potential to estimate the air quantity of high-speed airflow in various air conduit.
11901-15
Author(s): Chenhuan Wang, Kun Liu, Tianjin Univ. (China), Tianjin Optical Fiber Sensing Engineering Ctr. (China); Yuanyao Li, Tianjin Institute of Metrological Supervision and Testing (China); Dongfang Zhu, Shanghai Aerospace Control Technology Institute (China); Ming Pan, Zeen Chen, Haohan Guo, Yin Yu, Junfeng Jiang, Tiegen Liu, Tianjin Univ. (China), Tianjin Optical Fiber Sensing Engineering Ctr. (China)
On demand | Presented Live 11 October 2021
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We present a novel distributed high sensitivity static strain sensing method based on all grating optical fiber in optical frequency domain reflectometry (OFDR). Therefore, in the same cross-correlation method, our system obtains minor strain information due to the signal with higher signal-to-noise ratio. Using this system, we measured the change of strain at the end of a total 200 m FUT. the minimum measurable strain variation is 1 με, and the spatial resolution of the system is 10cm. Compared with the OFDR system using the single mode fiber, the OFDR system using all grating optical fiber can provide a better sensing performance of measuring a minor strain variation under the same sensing spatial resolution.
Break
Tea/Coffee Break 10:00 - 10:30
Session 4: Biological and Chemical Sensors II
In person: 11 October 2021 • 10:30 - 11:45 China Standard Time
Session Chair: Xiaopeng Dong, Xiamen Univ. (China)
11901-16
Author(s): Yize Liu, Junfeng Jiang, Kun Liu, Shuang Wang, Panpan Niu, Tong Wang, Tiegen Liu, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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Microfluidic optomechanical device are a unique optofluidics platform that can exhibit optomechanical oscillation in the 10-20 MHz, driven by radiation pressure (RP). The resonant enhancement of both mechanical and optical response in microcavity optomechanical devices allows exquisitely sensitive measurements of environment stimuli (pressure, force, sound speed change) and non-solid states of matter (freely flowing particles, viscous fluids). In this work, we experimentally investigate temperature tuning of these hollow-shell oscillators. We also demonstrate the effect of temperature on the frequency domain of optical machine oscillation resonance shift and applied it to the field of temperature sensing. Our result is a step towards optomechanical sensor in the field of temperature.
11901-17
Author(s): Jinsong Lu, Beijing Univ of Technology (China); Yaping Wang, Marion C. Lang, Mingqian Suo, Shijia Wang, Pu Wang, Xiuhong Wang, Beijing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
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We demonstrate that incorporating Förster resonant energy transferring (FRET) mechanism to the Whispering gallery mode (WGM) microcavity can greatly enhance the sensitivity. A donor-dye doped microsphere is embedded in an acceptor dye solution, which forms a FRET-WGM sensing platform. Pumping the WGM microcavity with a pulsed laser, we obtained simultaneous lasing of donor and acceptor dyes. The gap between donor and acceptor resonant wavelengths serves as a readout for acceptor quantification. Compared with the pure WGMs sensing system, the detection limit of FRET-WGM is greatly decreased, which enables us to realize real-time monitoring and quantitative analysis of intracellular fluorescent substance at single cell level.
11901-18
Author(s): Tong Wang, Junfeng Jiang, Kun Liu, Shuang Wang, Panpan Niu, Yize Liu, Tiegen Liu, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
11901-19
Author(s): Bingcheng Wu, Haiyang Bao, Yanfei Zhou, Yuan Liu, Jie Zheng, Jilin Univ. (China)
On demand | Presented Live 11 October 2021
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A bent core-offset in-line fiber Mach-Zehnder interferometer (MZIs) is proposed for refractive index (RI) sensing. After simply bending, not only the RI sensitivity but also the temperature sensitivity can be enhanced as the bending radius decreases. To solve the cross-sensitivity problem, a simultaneous measurement of RI and temperature was carried out. When the bending radius is 35.64mm, the highest RI sensitivity of -44.55nm/RIU for the RI range from 1.333 to 1.373, and the highest temperature sensitivity of 0.0799nm/℃ for the temperature range from 25℃ to 60℃ were measured simultaneously.
11901-20
Author(s): Anastasia Vladimirskaya, Ivan A. Lobach, Sergey I. Kablukov, Institute of Automation and Electrometry (Russian Federation); Vladimir A. Kamynin, Institute of General Physics (Russian Federation)
On demand
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A self-sweeping Ho-doped fiber laser with sweeping range of 10 nm near 2100 nm was experimentally demonstrated. The main feature of the self-sweeping laser is wavelength tuning without any electrical drivers for frequency tuning. All polarization maintaining cavity configuration and some approaches for the active fiber water cooling were applied to obtain robust laser operation. The linearly-polarized narrowband tunable radiation with average output power of more than 200 mW is generated. The developed source can be used for spectroscopy of Nitrous oxide, having absorption lines in that spectral region.
Break
Lunch Break 11:45 - 13:30
Poster Session
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Conference attendees are invited to attend the poster session on Monday afternoon. Come view the posters, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster Setup: Monday 10:00 to 13:00
View poster presentation guidelines and set-up instructions at
https://spie.org/PA/poster-presentation-instructions
11901-13
Author(s): Junzhen Jiang, Fujian Normal Univ. (China)
On demand | Presented Live 11 October 2021
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The differential group delay of polarization mode dispersion is calculated using simple vector analysis and Fourier analysis in fibers with randomly varying birefringence. We show that under weak random birefringence conditions and assuming each dispersion component to be statistically independent and Gaussian distributed, the general formula for polarization decorrelation can be derived from the polarization coherence matrix without having to solve complex stochastic differential equations using Stratonovich integration. The polarization decorrelation length is dependent on autocorrelation length and average beat length of fiber. This theory can supply some significant guidance for the design of fiber current sensor.v
11901-31
Author(s): Yibing Hou, Bin Wu, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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Fiber-optic interferometers (FOIs) are common methods in the field of sensing. However, several issues hinder the technological advancements and the expansion of the scope of applications, including the polarization fading effect, multimodal interferences, and difficulties in resolving the phase of an optical signal. Aiming at solving these problems, we theoretically and experimentally analyze an original method based on broadband light source carried microwave interferometry. Mathematical models of broadband light source interference, broadband light source modulation, and modulated signal interference are constructed and simulated. Proved that this method will eliminate the influence of optical interference and achieve accurate optical path difference (OPD) measurement by interrogating single frequency microwave interference pattern. Experiment results are in good agreement with theoretical calculations, which proves the superiority of the system in practice.
11901-32
Author(s): Haiyang Bao, Bingcheng Wu, Yuan Liu, Yanfei Zhou, Jie Zheng, Jilin Univ. (China)
On demand | Presented Live 11 October 2021
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A tilted long period grating (LPG) fabricated on a commercial plastic optical fiber (POF) by a simple mechanical die-press-print method was proposed for liquid-level sensing. The liquid level sensing performances of the sensor with different structural parameters were studied theoretically and experimentally. The results show that when the LPG fabricated on a POF with a diameter of 0.25mm and a tilted angle of 30° and the groove depth of 75μm, the highest sensitivity of -0.4631dB/mm was obtained in the level range of 20mm. Additionally, the influences of temperature on the liquid-level sensing performances of sensors were also studied. It shows that the sensitivity of the sensor was decreased with the increase of temperature.
11901-35
Author(s): Meijia Liu, Ya Weng, Yanhua Liu, Soochow Univ. (China)
On demand | Presented Live 11 October 2021
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In this work, we present a novel Ni@Au H2O2 sensor fabricated by employing both the direct laser writing lithography and selective electrodeposition techniques. The proposed sensing configuration exhibits excellent sensitivity and low detection limit of the hydrogen peroxide due to the large specific surface area of the self-supported nickel-metal mesh, as well as the remarkable electrocatalytic performance of Au nanoparticles when H2O2 is present. More specifically, the detection sensitivity of the employed structure in the concentration range of 0.05~96.55 μM is as high as 91.1 mAmM-1cm-2. Besides, we can still detect a significant amperometric response of the H2O2 for concentrations down to the value of 100 nM. Additionally, the interference signals produced by using various substances are usually less than 5% of the H2O2 response signal. Our sensing element possesses also outstanding flexibility and transparency properties, which renders it attractive for wearable applications.
11901-36
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China); quanxin ding, Ronggang Zhu, Science and Technology on Electro-optic Control Laboratory, China (China)
On demand | Presented Live 11 October 2021
11901-38
Author(s): Qiang Yao, State Grid Chongqing Electric Power Research Institute (China); Xianglian Yan, China Electric Power Research Institute (China); Shukai He, Rubin Qi, Xintian Li, Henan Relations Co. (China); Xiao-zhe Zeng, Henan Relations Co., Ltd. (China); Xinghui Wang, Henan Relations Co. (China); Shiling Zhang, State Grid Chongqing Electric Power Research Institute (China); Jigang Zi, Yunqi Yue, Henan Relations Co. (China)
On demand | Presented Live 11 October 2021
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The corresponding experimental system was designed, and the direct absorption technology based on the principle of tunable laser absorption spectrum of inter-band cascade laser (ICL) was used to detect low concentration of sulfur fluoride (SO2F2) gas.The position of 3619 nm is chosen as the measurement spectrum line of SO2F2 gas, which can effectively avoid the cross interference of background components. At 35℃ and 80 mA, the interband cascade laser can completely cover the absorption spectrum at 3619nm at the center of SO2F2 gas.The direct absorption spectrum of SO2F2 gas after deducting the background absorption is obtained by taking the logarithm of the ratio of the transmitted light intensity to the incident light intensity and the time-frequency conversion of the horizontal axis.
11901-41
Author(s): Zhenxing He, Wenzhou Univ. (China); Feng Liu, Wenzhou University (China); Wenping Zhang, Wenzhou Univ. (China); Guijun Hu, Jilin Univ. (China)
On demand | Presented Live 11 October 2021
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The fault detection sensitivity (FDS) analysis model for the splice fault of few-mode fiber (FMF) links under crosstalk conditions is constructed, which is based on the principle of FMF Rayleigh Backscattering. Under the condition of the effect of different modes of crosstalk, the variation trend of the loss characteristics of the fusion splicing fault and the FDS characteristics of the three-mode fiber LP01, LP11a and LP11b are analyzed, respectively. The simulation results show that as the crosstalk introduced by the axial misalignment of the fusion splice increases, the FDS of the LP11a and LP11b modes deteriorates higher than that of LP01 mode. Meanwhile, this paper build an FMF fusion fault detection system based on photon lantern and fiber circulators. The experimental results shows that the results are consistent with the simulation results, which shows the feasibility of the FDS analysis model under the effect of crosstalk in the FMF link.
11901-43
Author(s): Bo Wang, Lei An, Bin Liu, Xiangtan Univ. (China)
On demand | Presented Live 11 October 2021
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In this paper, we proposed to apply a SMI system at strong feedback regime for measurement of damping vibration. Simulation was performed. The results of the simulation verified the feasibility of the proposed method. It shows that a SMI system at strong feedback regime can achieve linear sensing even without need of extra SMI fringe processing, contributing a new simple solution for measurement of damping vibration.
11901-45
Author(s): Zhigang Zhang, China Oilfield Services Ltd. (China); Bo Zhu, Hangzhou Ruili Acoustics & Electrical Technology Co., Ltd. (China); Pengfei Liu, Hangzhou Applied Acoustics Research Institute (China)
On demand | Presented Live 11 October 2021
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This paper introduces a distributed optical fiber temperature measurement system for temperature profile measurement of oil Wells.By using the reference light source to measure the loss of Rayleigh scattered light, the transmission loss of each working wavelength in the distributed fiber temperature measurement system is obtained online, and the influence of the optical fiber propagation loss caused by the stress concentration or damage of the optical cable on the distributed fiber temperature measurement is corrected.A new distributed optical fiber temperature measuring system was built, and the temperature test was carried out. The test results show that the system improves the accuracy of distributed optical fiber temperature measurement, and improves the adaptability and compatibility of distributed optical fiber temperature measuring system to optical cable.
11901-46
Author(s): Ruoqi Sun, Liang Zhang, Heming Wei, Yana Shang, Lina Xiang, Shanghai Univ. (China); Fufei Pang, Shanghai Univ (China)
On demand | Presented Live 11 October 2021
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In this paper, a magnetic field sensor based on Terfenol-D coated optical fibers is proposed and demonstrated. In our scheme, standard single mode fibers are coated by a thick layer of a magnetostrictive composite consisting of Terfenol-D particles dispersed in a polymer, which is then utilized as sensing elements. The magnetic field-induced strain on single mode fibers coated by the Terfenol-D was interrogated by an optical frequency-domain reflectometry (OFDR). The experimental results show that the sensitivity of the magnetostrictive fiber sensor depends on the coating characteristics including the surface of coated optical fiber. The sensitivity of the proposed sensor is 0.175 με/mT.
11901-48
Author(s): Xiao Dong, Yihua Hu, Shilong Xu, Yufa Zhang, National Univ. of Defense Technology (China)
On demand | Presented Live 11 October 2021
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The aerosol scattering characteristics of laser affect the performance of coherent lidar system. Moreover, due to the limited spatial coherence of actual laser and the atmospheric turbulence, there are additional attenuations in coherent detection. Based on the GSM beam and the generalized Huygens-Fresnel principle, the propagation model of truncated GSM beam in turbulent environment is established using hard edge aperture function. Then the variations of mean intensity, intensity probability distribution and complex coherence degree of the backscattered light field are obtained considering the light source coherence, atmospheric turbulence and optical structure. The changeable rule of turbulence enhancement effect for aerosol scattering is also analyzed. The result shows that the laser partial coherence can be equivalent to the turbulence, which provides a reference for the design and analysis of long-range and high-precision coherent lidar system.
11901-49
Author(s): Kexin Cui, Beijing Univ. of Posts and Telecommunications (China); Fei Liu, Univ. of Science and Technology Beijing (China); Kui-Ru Wang, Beijing Univ. of Posts and Telecommunications (China); Xiaojun Liu, Univ. of Science and Technology Beijing (China); Jin-Hui Yuan, Bin-Bin Yan, Beijing Univ. of Posts and Telecommunications (China); Xian Zhou, Univ. of Science and Technology Beijing (China)
On demand | Presented Live 11 October 2021
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This paper proposed a spectrum extraction and rotated-vector-sum (SERVS) method to solve the fading problem when ensuring a high SNR of the demodulated signal in pulse-coding Φ-OTDR system. The experiment results demonstrate that the percentage of interference fading points is reduced from 2.98% to 0.33% in 8-bit Golay pulse-coding Φ-OTDR system with a sensing range of 2 km. And it is obvious that the phase noises along the fiber are reduced effectively from the averaged PSD of the differential phase at all locations. In addition, the SNR of the demodulated phase is 46.46 dB, which maintains a high SNR than the single-pulse Φ-OTDR, and is about 8.6 dB higher than the single-pulse Φ-OTDR.
Session 5: New Sensor Devices and Systems
In person: 11 October 2021 • 14:30 - 15:15 China Standard Time
Session Chair: Zuyuan He, Shanghai Jiao Tong Univ. (China)
11901-21
Author(s): Yan Zhao, Chuanyi Tao, Hao Wang, Jianjun Xiao, Chongqing Univ. of Technology (China); Jingke Li, Chongqing Medical and Pharmaceutical College (China); Wei Wang, Xuhai Jiang, Chongqing Univ. of Technology (China)
On demand | Presented Live 11 October 2021
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In this paper, we propose a semiconductor optical amplifier (SOA)-fiber ring laser (FRL) for fiber Bragg grating (FBG) dynamic strain sensing system with an adaptive demodulator based on two-wave mixing (TWM) photorefractive interferometry. Any strain in the FBG is encoded as a wavelength shift of the light reflected by the FBG. The wavelength modulation is perfectly converted to intensity modulation by splitting the light into signal and pump beams and interfering the beams in an photorefractive InP:Fe crystal. The classical beam-combiner was replaced by a dynamic hologram continuously recorded in the InP:Fe crystal. The results demonstrate that TWM interferometer has the characteristics of adaptability and multiplexing. To investigate multiplexability, a three-channel SOA-fiber ring laser sensor system is presented to detect dynamic strain signals from three FBG sensors simultaneously.
11901-23
Author(s): Ying Shi, Bingxin Xu, Lin Ma, Junjie Xiong, Xinyu Fan, Yudi Zhuang, Zuyuan He, Shanghai Jiao Tong Univ. (China)
On demand | Presented Live 11 October 2021
11901-24
Author(s): Makoto Hasegawa, Takato Chiba, Yu Miyakoshi, Chitose Institute of Science and Technology (Japan)
On demand
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For the purpose of utilizing changes in speckle patterns to be observed in an output light spot from an optical fiber for sensing applications, certain load was applied onto an optical fiber in which laser beams were propagating and resultant changes in the output light intensity were measured. For the load application up to 40 kg, certain reductions in the output light intensity due to changes in the speckle patterns were observed. Even with load application of smaller load level, similar changes were observed. Correlation between the output intensity changes and the pattern changes are investigated.
11901-25
Author(s): Artem Budarnykh, Ivan A. Lobach, Nikolay Smolyaninov, Institute of Automation and Electrometry (Russian Federation)
On demand
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Besides all the advantages of self-sweeping lasers (simple scheme, broad range tuning, narrow linewidth, and linear polarization state) there is a main drawback consisting of lack of wavelength control. In the present work, automatic control of the tuning parameters (sweeping rate and wavelength) is demonstrated using a Tm-doped fiber self-sweeping laser as an example. The method consists of measuring the laser wavelength without using high-resolution equipment, fast data processing to obtain the sweeping direction and the sweeping rate, and subsequent automatic adjustment of the pump power with a feedback loop. The automatic control will provide the possibility of performing more delicate measurements in the field of gas absorption spectroscopy.
Break
Tea/Coffee Break 15:15 - 15:45
Session 6: New Sensor Techniques and Applications
In person: 11 October 2021 • 15:45 - 17:00 China Standard Time
Session Chair: Zuyuan He, Shanghai Jiao Tong Univ. (China)
11901-26
Author(s): Qi Wu, Nanjing Univ. of Aeronautics and Astronautics (China); Rong Wang, Wulin Lan, Hanqi Zhang, Hongzhou Zhai, Nanjing University of Aeronautics and Astronautics (China)
On demand | Presented Live 11 October 2021
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Fiber Bragg grating has been widely used as a sensor for detecting static quantities such as strain and temperature, but it is still difficult to detect ultrasonic guided waves due to the limitation of sensitivity and bandwidth. By comparing the traditional fiber Bragg grating and the phase-shifted fiber Bragg grating (PSFBG), it was found that the latter has a shorter and effective grating length and steeper slope. Thus, the PSFBG can greatly improve bandwidth and sensitivity, which is suitable for the detection of ultrasonic Lamb waves. Furthermore, a high-speed demodulator and a feedback controller were designed and integrated with the PSFBG to reduce the noise and enhance the robustness of the sensing system. The excellent performance of the PSFBG-based system is demonstrated in linear and nonlinear acousto-ultrasonic detection, and acoustic emission detection, by comparing with the PZT sensors.
11901-27
Author(s): Lei An, Bo Wang, Bin Liu, Xiangtan Univ. (China)
On demand | Presented Live 11 October 2021
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In this paper, we propose a method for measuring line-width enhancement factor, also called α factor, of semiconductor lasers. The method is based on back-propagation neural network (BPNN). The results of the BPNN model showed that the R2 value was 0.99873, and the results were following the requirement model. After 2000 iterations, the error in the objective function was 0.0001, which met the convergence requirements for the final solution. The accuracy of the method has been confirmed and tested by computer simulations, which show that the method can estimate α with an absolute error of 0.08.
11901-28
Author(s): Ling Liu, Tigang Ning, Beijing Jiaotong Univ. (China); Xueyin Sun, Beijing Institute of Spacecraft Environment Engineering (China); Jian Xu, Beijing Jiaotong Univ. (China); Jingchuan Zhang, Beijing Institute of Spacecraft Environment Engineering (China); Haidong You, Qingdao Agricultural Univ. (China)
On demand | Presented Live 11 October 2021
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An interrogation system with Michelson interferometer (MI)-based sensors incorporating an optoelectronic oscillator (OEO) is proposed and demonstrated. By utilizing the sinusoidal nature of the MI spectrum, we can achieve a single-passband microwave photonic filter (MPF), which would determine the OEO output ultimately. When the free spectral range of the MI changes with the environmental factors, the central frequency of the MPF shifts, resulting in the frequency shift of the OEO output correspondingly. Hence, by measuring the frequency shift of the OEO output, we can experimentally track and demodulate the change of environmental factors, including temperature and strain. Such a wavelength-to-frequency mapping provides a flexible way for large-scale and high-resolution sensing of conventional optical sensors.
11901-29
Author(s): Zhiyuan Li, Shuang Wang, Junfeng Jiang, Yin Yu, Haokun Yang, Wenyan Liu, Peng Zhang, Tiegen Liu, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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The orthogonal phase demodulation method can effectively avoid the problem of the working interval of the optical fiber Fabry-Perot (F-P) sensor and has high accuracy. In order to verify the frequency band response of the orthogonal phase demodulation system based on birefringence crystals and polarization technology, the demodulation of acoustic signals of frequencies in the range of 200Hz-25kHz is conducted. The results show that the orthogonal phase demodulation system based on birefringence crystals and polarization technology has a wide frequency band response.
11901-30
Author(s): Zhou Ge, Yanmin Zhu, Yunping Zhang, Edmund Y. Lam, The Univ. of Hong Kong (Hong Kong, China)
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Dynamic speckle analysis (DSA) is a non-invasive method to detect movements of the inspected objects. By illuminating the observed sample using a coherent light source, motion information can be obtained from a series of reflecting speckle patterns. Conventional DSA methods record the intensity of the speckle patterns using a frame-based imaging sensor. Here, we propose a novel implementation of DSA using the event sensor which captures the brightness changes of the dynamic speckle patterns with high temporal resolution and low latency. Our method is based on block matching algorithm in which the captured event stream is divided into many non-overlapping blocks and motion information can be computed by searching for the most likely blocks. The experiment results demonstrate the feasibility of our proposed method in different dynamic levels and this work will be beneficial for various applications such as biomedical imaging and material science.
Conference Chair
Shanghai Jiao Tong Univ. (China)
Conference Chair
The Univ. of New South Wales (Australia)
Program Committee
Univ. of Ottawa (Canada)
Program Committee
Univ. of Pittsburgh (United States)
Program Committee
City Univ. of Hong Kong (Hong Kong, China)
Program Committee
Univ. of Strathclyde (United Kingdom)
Program Committee
Univ. of Michigan (United States)
Program Committee
Univ. of California, Santa Cruz (United States)
Program Committee
Jinan Univ. (China)
Program Committee
Zhejiang Univ. (China)
Program Committee
AdValue Photonics, Inc. (United States)
Program Committee
Wei Jin
Shenzhen Research Institute (China)
Program Committee
Huazhong Univ. of Science and Technology (China)
Program Committee
Tianjin Univ. (China)
Program Committee
Niels Neumann
TU Dresden (Germany)
Program Committee
Beijing Jiaotong Univ. (China)
Program Committee
Xueguang Qiao
Northwest Univ. (China)
Program Committee
Yunjiang Rao
Univ. of Electronic Science and Technology of China (China)
Program Committee
Tobias Schuster
Evonik Industries AG (Germany)
Program Committee
Virginia Polytechnic Institute and State Univ. (United States)
Program Committee
Tingyun Wang
Shanghai Univ. (China)
Program Committee
Clemson Univ. (United States)
Program Committee
X. Steve Yao
General Photonics Corp. (United States)
Program Committee
The Pennsylvania State Univ. (United States)
Program Committee
Univ. of California, San Diego (United States)
Program Committee
Harbin Engineering Univ. (China)
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