Optical Fourier transformer device and optical correlator incorp

Details Optical Fourier transformer device and optical correlator incorp Optical Fourier transformer device and optical correlator incorp

1982-02-02

1985-04-30

Arnold, Bruce Y.

Boots, shoes, and leggings

35016214, 364822, G06G 900

Patent

active

045140383

ABSTRACT:
This optical Fourier transformer device supplying the correlation function of two motifs of an object illuminated in coherent light by using the double diffraction principle is essentially characterized in that it generates a complex wave conjugate of a wave modulated by the object propagating in the opposite direction to the latter. This conjugate wave is produced by double diffraction in an interaction medium and compensates the distortions induced by the optical components of the system. The optical correlator system utilizing this Fourier transformer is essentially characterized in that it uses a recyclable material as the recording medium. A reading beam is subject to an angular scan making it possible to optimize the diffraction efficiency of this medium. The beam modulated by the object and the reading beam are synchronously deflected to improve the signal to noise ratio in the output plane.

REFERENCES:
Applied Optics, vol. 15, No. 6, Jun. 1976, by: S. Iwasa: "Optical Processing: A Near Real-Time Coherent System Using Two Itek PROM Devices", pp. 1418-1429.
Applied Optics, vol. 15, No. 11, Nov. 1975; by P. Nisenson et al: "Real-Time Optical Correlation", pp. 2602-2606.
Proceedings of the IEEE, vol. 65, No. 1, Jan. 1977, by: B. J. Thompson: "Hybrid Processing Systems--An Assessement", pp. 62-76.

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