2008•Optics and SpectroscopyRequires access

Dynamic holographic joint fourier transform correlator based on a CdF2:Ga crystal

Igor Fedorov, Aleksandr E. Angervaks, Vladimir K. Sokolov, Aleksandr S. Shcheulin

Abstract

A joint Fourier transform correlator based on a bulk holographic medium—a CdF 2 :Ga crystal serving a dynamic matched spatial-frequency filter—is implemented. Specific features of the correlator design are discussed. Correlatorf’s possibilities for selective recognition of objects of different type are demonstrated. Experimental data, results of mathematical modeling, and their analysis are reported. Suggestions for modifying the correlator scheme in order to improve its characteristics (operating speed, stability with respect to orientational and scale changes in objects, signal-to-noise ratio, correlation peak sharpness) are formulated.

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Key concepts: Optical correlator, Holography, Fourier transform, Joint (building), Spatial light modulator, Computer science, Noise (video), SIGNAL (programming language)