Accession Number : ADD009531

Title :   Acousto-Optic Time Integrating Correlator.

Descriptive Note : Patent,


Personal Author(s) : Berg,Norman J ; Casseday,Michael W ; Lee,John N ; Abramovitz,Irwin J

Report Date : 27 Apr 1982

Pagination or Media Count : 7

Abstract : A highly efficient time integrating acousto-optic correlator which determines the time difference of arrival of the signals being correalted 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 (Beta) between them where theta (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. (Author)

Descriptors :   *Patents, *Correlators, Radio reception, Radio signals, Signal processing, Correlation techniques, Surface acoustic wave devices, Surface acoustic waves, Laser beams, Interactions, Bragg angle, Photoelectric cells(Semiconductor), Integration, Time, Acoustooptics, Radar signals, Reception

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE