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Proceedings Paper

Development of a prototype sensor system for ultra-high-speed LDA-PIV
Author(s): Jennifer A. Griffiths; Gary J. Royle; Sarah E. Bohndiek; Renato Turchetta; Daoyi Chen
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Paper Abstract

Laser Doppler Anemometry (LDA) and Particle Image Velocimetry (PIV) are commonly used in the analysis of particulates in fluid flows. Despite the successes of these techniques, current instrumentation has placed limitations on the size and shape of the particles undergoing measurement, thus restricting the available data for the many industrial processes now utilising nano/micro particles. Data for spherical and irregularly shaped particles down to the order of 0.1 µm is now urgently required. Therefore, an ultra-fast LDA-PIV system is being constructed for the acquisition of this data. A key component of this instrument is the PIV optical detection system. Both the size and speed of the particles under investigation place challenging constraints on the system specifications: magnification is required within the system in order to visualise particles of the size of interest, but this restricts the corresponding field of view in a linearly inverse manner. Thus, for several images of a single particle in a fast fluid flow to be obtained, the image capture rate and sensitivity of the system must be sufficiently high. In order to fulfil the instrumentation criteria, the optical detection system chosen is a high-speed, lensed, digital imaging system based on state-of-the-art CMOS technology - the 'Vanilla' sensor developed by the UK based MI3 consortium. This novel Active Pixel Sensor is capable of high frame rates and sparse readout. When coupled with an image intensifier, it will have single photon detection capabilities. An FPGA based DAQ will allow real-time operation with minimal data transfer.

Paper Details

Date Published: 28 April 2008
PDF: 9 pages
Proc. SPIE 7003, Optical Sensors 2008, 700313 (28 April 2008); doi: 10.1117/12.781177
Show Author Affiliations
Jennifer A. Griffiths, Univ. College London (United Kingdom)
Gary J. Royle, Univ. College London (United Kingdom)
Sarah E. Bohndiek, Univ. College London (United Kingdom)
Renato Turchetta, Rutherford Appleton Lab., STFC (United Kingdom)
Daoyi Chen, Univ. of Liverpool (United Kingdom)

Published in SPIE Proceedings Vol. 7003:
Optical Sensors 2008
Francis Berghmans; Patrick P. Meyrueis; Thomas P. Pearsall; Anna Grazia Mignani; Antonello Cutolo, Editor(s)

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