1977-06-07
1979-02-13
Sikes, William L.
G02F 111
Patent
active
041392779
ABSTRACT:
An apparatus for performing the correlation of a real-time signal, and a red signal or signals, and two methods of storing signals as index of refraction variation patterns in piezoelectric crystals. A modulated R.F. signal is stored in a piezoelectric crystal by converting the signal to an acoustic signal which is then propagated across the length of the crystal. A portion of the surface of the crystal is irradiated by a high-frequency, short-duration laser pulse, and the acoustic signal is stored as a variable index of refraction pattern at the irradiated areas. When a real-time signal is propagated across the stored signal, and the surface of the crystal is irradiated with a laser beam, the correlation of the real-time signal and the stored signal is obtained upon demodulation of the laser beam.
REFERENCES:
patent: 3919700 (1975-11-01), Cozzo et al.
Adams, legal representative by Allen B.
Berg Norman J.
Smith, deceased Bob L.
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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