A WIDE-BAND OPTICAL CORRELATOR AND MATCHED FILTER USING DIFFRACTION OF LIGHT BY ULTRASONIC WAVES.
Abstract
An opto-acoustic device is proposed that can serve either as a correlation detector or a matched filter, and has a nominal bandwidth of 500 MHz and a time-bandwidth product of several thousand. The device consists of a pair of small (5-by-5-by-20-mm) microwave acoustic cells in close juxtaposition, which successively modulate a laser beam incident at the Bragg angle. This modulated light is focused to a point on a photodetector. The output of the photodetector represents the correlation function or matched-filter output for electrical signals that generate the acoustic disturbances in the two cells. An analysis of the device is presented and the derivation of its performance characteristics is described. Completed laboratory experiments that demonstrate feasibility are described and some of the engineering problems anticipated in developing an operational unit are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1968
- Accession Number
- AD0841081
Entities
People
- J. M. Alsup
- W. D. Squire
Organizations
- Naval Undersea Warfare Center