Compact 2f optical correlator

Details Compact 2f optical correlator Compact 2f optical correlator

1990-03-30

1991-12-17

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

364827, 382 42, G02B 2742

Patent

active

050730061

ABSTRACT:
A 2f Fourier transform optical correlator uses two simple, single element lenses, with the second lens performing both quadratic phase term removal and the inverse Fourier transform operation in a compact two-focal-length space. This correlator performs correlations quite well and uses three less lens elements than a prior 2f system, is shorter by a factor of two compared to the standard 4f system, and uses one less lens than the 3f system, while still retaining the variable scale feature.

REFERENCES:
patent: 3880497 (1975-09-01), Bryngdahl
patent: 4118107 (1978-10-01), Parrent, Jr. et al.
patent: 4360269 (1982-11-01), Iwamoto et al.
patent: 4695973 (1987-09-01), Yu
patent: 4765714 (1988-08-01), Horner et al.
patent: 4869574 (1989-09-01), Hartman
Flavin, Mary A. et al., "Amplitude Encoded Phase-Only Filters", Applied Optics, vol. 28, No. 9, May 1, 1989, pp. 1692-1696.

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