Velocity filtering using complementary gratings in photorefractive BSO


Hussain, G. and Eason, R.W. (1991) Velocity filtering using complementary gratings in photorefractive BSO. Optics Communications, 86, (2), 106-112. (doi:10.1016/0030-4018(91)90543-M).

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Description/Abstract

We demonstrate a new optical technique for velocity filtering and feature extraction of time varying optical images. The technique exploits the recording of complementary (multiplexed) gratings with a relative phase shift of 180° in a photorefractive material, BSO, via a degenerate four wave mixing (DFWM ) configuration. For experimental parameters, such as grating response time and optimised total input intensity. almost complete subtraction is achieved in the phase conjugate output. When motion occurs in the object plane a bright output image is observed depending on the experimental variables of feature size and velocity. We present results for motion detection of features of various dimensions at a range of speeds in both x and y directions and via Fourier plane observation.

Item Type: Article
ISSNs: 0030-4018 (print)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 78557
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:59
URI: http://eprints.soton.ac.uk/id/eprint/78557

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