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Proceedings Paper

Focal-plane processing algorithm and architecture for laser speckle interferometry
Author(s): Harold W. Tomlinson; Michael P. Weir; G. J. Michon; George E. Possin; Joseph L. Chovan
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Paper Abstract

A focal-plane processing array for laser speckle interferometry is described. The imager consists of a 32 X 32 array of analog processing elements which determine the average phase shift of a holographic fringe pattern. The phase computation algorithm requires only the addition, subtraction and rectification (absolute value) of signals from adjacent pixels in the imager. Charge-coupled device structures are used to implement these operations in parallel and eliminate the need to read the pixel data off the array. This allows imager frame rates in excess of 104 frames/sec to be achieved. The imager sensitivity is currently limited by a 20% fill factor and non ideal performance of the rectifier. A higher resolution array is currently being designed which utilizes amorphous silicon photodiodes to improve the fill factor. This design also includes an integrated amplifier at each pixel to obtain photon shot noise limited sensitivity.

Paper Details

Date Published: 1 November 1991
PDF: 9 pages
Proc. SPIE 1541, Infrared Sensors: Detectors, Electronics, and Signal Processing, (1 November 1991); doi: 10.1117/12.49332
Show Author Affiliations
Harold W. Tomlinson, GE Corporate Research and Development (United States)
Michael P. Weir, GE Corporate Research and Development (United States)
G. J. Michon, GE Corporate Research and Development (United States)
George E. Possin, GE Corporate Research and Development (United States)
Joseph L. Chovan, GE Corporate Research and Development (United States)


Published in SPIE Proceedings Vol. 1541:
Infrared Sensors: Detectors, Electronics, and Signal Processing
T. S. Jay Jayadev, Editor(s)

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