Dual-template optical correlator with interferometric detection for improved discrimination

Freddie Yun Heng Chin; Michael G. Somekh; John A. Crowe

doi:10.1117/12.140404

2 March 1993 Dual-template optical correlator with interferometric detection for improved discrimination

Freddie Yun Heng Chin, Michael G. Somekh, John A. Crowe

Proceedings Volume 1732, Holographics International '92; (1993) https://doi.org/10.1117/12.140404
Event: Holographics International '92, 1992, London, United Kingdom

Abstract

A novel coherent optical processor for discriminating between similar patterns is described. A multiplexed hologram of two complex spatial filters (CSF) synthesized with a common reference beam provides the correlation. The two halves of the template pattern are encoded in the two CSFs. The response of the system consists of two sets of reconstructed waves that interfere at the output plane. One set of the waves is made to phase shift with respect to the other. A phase shifting interferometric technique extracts the product of the two correlation signals. Results are shown to demonstrate improved discrimination over a traditional optical correlator.

Citation Download Citation

Freddie Yun Heng Chin, Michael G. Somekh, and John A. Crowe "Dual-template optical correlator with interferometric detection for improved discrimination", Proc. SPIE 1732, Holographics International '92, (2 March 1993); https://doi.org/10.1117/12.140404

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