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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), pp. 106-112. (doi:10.1016/0030-4018(91)90543-M).

Record type: Article


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.

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Published date: 1991
Organisations: Optoelectronics Research Centre


Local EPrints ID: 78557
ISSN: 0030-4018
PURE UUID: 3b598f7f-1928-4200-acdf-9186cdb8b95f
ORCID for R.W. Eason: ORCID iD

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:23

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Author: G. Hussain
Author: R.W. Eason ORCID iD

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