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).


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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
Digital Object Identifier (DOI): doi:10.1016/0030-4018(91)90543-M
ISSNs: 0030-4018 (print)
Related URLs:
ePrint ID: 78557
Date :
Date Event
Date Deposited: 11 Mar 2010
Last Modified: 18 Apr 2017 20:21
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