Accession Number : ADD006629

Title :   Acoustooptic Memory Correlator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Berg,Norman J

Report Date : 13 Feb 1979

Pagination or Media Count : 6

Abstract : An apparatus for performing the correlation of a realtime signal, and a stored 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. (Author)

Descriptors :   *Patents, *Optical correlators, *Acoustooptics, *Memory devices, Optical storage, Piezoelectric crystals, Acoustic signals, Demodulation, Refractive index, Real time

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices
      Acoustooptic and Optoacoustic Devices
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE