Acoustooptic Time Integrating Frequency Scanning Correlator
Abstract
This abstract discloses an acousto-optic time integrating two-dimensional frequency scanning correlator for cross-correlating signals which are separated in frequency. Two coherent light beams which are derived from the same laser are fed across respective Bragg cells, one cell having the signal A(t) cos omega sub A t propagating thereacross and the other cell having the signal B(t) cos omega sub B t propagating thereacross. The respective output beams are comprised in the x direction and expanded in the y direction and are made incident on an acousto-optical correlator device having chirp signals counter-propagating thereacross. The optical output is fed to a time-integrating photodiode array which provides an output signal corresponding to the cross-correlation of A(t) and B(t). In a further embodiment, the two Bragg cells are replaced by a single Bragg cell and beams having different polarizations are fed thereacross. In a still further embodiment, only a single crystal is used which has the A(t) and B(t) signals, as well as the chirp signals, counter-propagating thereacross.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 06, 1981
- Accession Number
- ADD008585
Entities
People
- Norman J. Berg
Organizations
- United States Army