Multichannel acousto-optic correlator for time delay computation

Details Multichannel acousto-optic correlator for time delay computation Multichannel acousto-optic correlator for time delay computation

1994-07-07

1995-09-26

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

382278, G01B 902

Patent

active

054538351

ABSTRACT:
A first signal acousto-optic (AO) cell together with a first signal source for injecting a first signal therein is disclosed along with a second AO cell together with a second signal source for injecting a second signal therein, to be correlated with the first signal. A first plus one diffracted order beam emerges from the first cell and is directed at a second cell to produce second and third plus one diffracted order beams which overlap and which produce an interference pattern that is focused on a photodetector array which determines the degree of correlation between the first and second signals. A Dove prism is employed between the cells to cause the second and third beams at the array to be counter-propagating and to control the spatial frequency of the interference pattern produced by these beams.

REFERENCES:
patent: 5002395 (1991-03-01), Shah
patent: 5116126 (1992-05-01), Wang et al.
patent: 5187543 (1993-02-01), Ebert
patent: 5237390 (1993-08-01), Chaney
"Multichannel Acousto-Optic Correlator for Time Delay Computation", C. W. Keefer et al, SPIE Proceedings, vol. 2240, Apr. 1994.

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