Accession Number : ADD003122

Title :   Holographic Signature Processor.

Descriptive Note : Patent Application,


Personal Author(s) : Simpson,Homer L , Jr

Report Date : 26 Aug 1976

Pagination or Media Count : 22

Abstract : In the patent application a signature is holographically recorded for correlation and parallel processing against a large library of signatures. A transient electrical signal produces a pressure wave in an optical wavefront modulator where it is frozen in position by a picosecond laser. The modulated wavefront is made to interfere at a hologram plane with a reference wavefront which is converging to a focal point behind the hologram plane. Because the holograms are of the Fresnel type, the hologram plane may be partitioned off and a library of signatures may be recorded on the same hologram plane and addressed simultaneously. After processing, the reference wave is removed and the optical wavefront modulator illuminated by a continuous wave coherent source. If a signature, recorded on the hologram, is placed in the optical wavefront modulator, then the reference wave for that hologram is reconstructed and detected to identify that signature.

Descriptors :   *Optical signatures, *Data processing equipment, Holography, Target signatures, Optical correlators, Coherent radiation, Laser beams

Subject Categories : Holography
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE