Acoustooptic Real Time Correlator.
DEPARTMENT OF THE ARMY WASHINGTON D C
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The patent relates to an acousto-optic correlator device comprised of two parallel piezoelectric crystals having different acoustic velocities. Acoustic transducers are located at one end of the respective crystals, and high frequency acoustic waves, the pulse envelopes of which correspond to the signals to be correlated are simultaneously launched from the transducers on the respective crystals. One of the acoustic waves slides past the other, and a laser beam, which is directed approximately perpendicular to the direction of acoustic propagation is modulated by the acoustic waves. The laser beam is demodulated and the desired correlation is obtained.
- Radiofrequency Wave Propagation