Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1981-04-06
1983-12-20
Sikes, William L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333150, G02F 111
Patent
active
044213883
ABSTRACT:
An acousto-optic time integrating two-dimensional frequency scanning correlator for cross-correlating signals which are separated in frequency. Two coherent light beams which are derived from the same laser are fed across respective Bragg cells, one cell having the signal A(t) cos .omega..sub.A t propagating thereacross and the other cell having the signal B(t) cos .omega..sub.B t propagating thereacross. The respective output beams are comprised in the x direction and expanded in the y direction and are made incident on an acousto-optical correlator device having chirp signals counter-propagating thereacross. The optical output is fed to a time-integrating photodiode array which provides an output signal corresponding to the cross-correlation of A(t) and B(t). In a further embodiment, the two Bragg cells are replaced by a single Bragg cell and beams having different polarizations are fed thereacross. In a still further embodiment, only a single crystal is used which has the A(t) and B(t) signals, as well as the chirp signals, counter-propagating thereacross.
REFERENCES:
patent: 4110016 (1978-08-01), Berg et al.
patent: 4139277 (1979-02-01), Berg et al.
patent: 4326778 (1982-04-01), Berg et al.
"Time Integrating Acousto--optic correlator"; Sprague et al. App. Opt., v 15, No. 1 Jan. 1976.
Abramovitz Irwin J.
Berg Norman J.
Casseday Michael W.
Lee John N.
Elbaum Saul
Gibson Robert P.
Lane Anthony T.
Scott Leon
Sikes William L.
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