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Fast holographic correlator for machine vision systems

This paper presents a feasibility study of the use of coherent optical pattern recognition devices as machine vision systems. The fast holographic correlator carrying out real-time data input in the processing channel, coherent holographic filter recording, and correlation image processing is investigated. A detailed analysis is given of the basic components of the coherent optical processor, considering specific requirements to the equipment, and the prospects are outlined for the use of the pulsed solid- state laser, the input unit based on the liquid crystal spatial-temporal light modulator, and FTIROS reversible registering medium for the high-speed filter- hologram synthesis. A schematic diagram of the fast holographic correlator, performance of its basic elements, and the results of the experimental tests on pattern recognition are presented.