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Feature recognition system

  • US 3,984,802 A
  • Filed: 06/27/1966
  • Issued: 10/05/1976
  • Est. Priority Date: 06/27/1966
  • Status: Expired due to Term
First Claim
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1. A feature recognition system for identifying the source of a radiated energy signal comprising, in combination:

  • receiver means adapted to receive the radiated signal and for producing an electrical output control signal modulated according to the radiated signal;

    first laser means electrically connected to said receiver means to receive the control signal and for producing a first collimated coherent light beam at its output having a frequency which varies according to the control signal;

    second laser means for producing a second collimated coherent light beam at its output having a constant frequency;

    first optical means positioned to receive said first and second beams for superimposing one of said light beams on the other producing thereby a third collimated coherent light beam at its output with interferometric lines;

    second optical means positioned to receive and condense said third beam and adapted to receive photosensitive film for exposing the film to said third beam at the focal point;

    processor means positioned to receive the exposed film from said second optical means and develop the film forming thereby a hologram; and

    third optical means positioned to receive said second beam and adapted to receive said hologram for cross-correlating the features of a reference with said hologram, the reference having the recognizable unique features of a known radiated energy source imaged on a transparent material.

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