Patent
1980-05-12
1982-04-27
Sikes, William L.
350169, H03H 925, G02F 133
Patent
active
043267785
ABSTRACT:
A highly efficient time integrating acousto-optic correlator which determs the time difference of arrival of the signals being correlated as well as the center frequency and bandwidth of the signals. A surface acoustic wave delay line is provided with two counter-propagating surface acoustic waves with wavefronts tilted with respect to each other. Two laser beams are directed across the propagating waves with an angle of 4.theta..sub..beta. between them where .theta..sub..beta. is the Bragg angle, so that one beam interacts primarily with one propagating wave while the other beam interacts primarily with the other wave. The modulated optical beams are directed to a time-integrating photodetector means which provides a signal output corresponding to the correlation function.
REFERENCES:
patent: 4110016 (1978-08-01), Berg et al.
patent: 4124280 (1978-11-01), Berg et al.
Abramovitz Irwin J.
Berg Norman J.
Casseday Michael W.
Lee John N.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
Sikes William L.
The United States of America as represented by the Secretary of
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