Recursive optical filter system

Details Recursive optical filter system Recursive optical filter system

1983-05-26

1985-06-11

Arnold, Bruce Y.

Boots, shoes, and leggings

364822, G02B 522, G06G 900

Patent

active

045224668

ABSTRACT:
An optical notching or filtering system in which a beam of optical radiation is passed through the optical filtering means a multiplicity of times. The optical filtering means has an optical Fourier transform means, a spatial filter, optical inverse Fourier transform means, and a reflector array. After an input optical signal beam undergoes a filtering pass by being directed through the transform means, the filter, and the inverse transform means, the reflector array re-introduces the beam for a multiplicity of subsequent filtering passes. Four embodiments of the system of the invention having various configurations of the reflector arrays for use with one- and two-dimensional spatial filters are disclosed. The various embodiments are set forth as being used in a heterodyning optical notching filter system.

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Turpin, T. M., "Spectrum Analysis Using Optical Processing," Proceedings of the IEEE, vol. 69, No. 1, Jan. 1981, pp. 79-92.
Rhodes, W. T., "Acousto-Optic Signal Processing: Convolution and Correlation", Proceedings of the IEEE, vol. 69, No. 1, Jan. 1981, pp. 65-79.
Korpel, A. "Acousto-Optics-A Review of Fundamentals", Proceedings of the IEEE, vol. 69, No. 1, Jan. 1981, pp. 48-53.
Lee, J. N. et al., "High Speed Adaptive Filtering and Reconstruction . . . Using A/O Techniques", IEEE Ultrasonics Conference, 1981.

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