Acousto-Optic Time Integrating Correlator.
DEPARTMENT OF THE ARMY WASHINGTON DC
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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
- Line, Surface and Bulk Acoustic Wave Devices
- Acoustooptic and Optoacoustic Devices