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Holographic object position and type sensing system and method

  • US 6,356,854 B1
  • Filed: 04/05/1999
  • Issued: 03/12/2002
  • Est. Priority Date: 04/05/1999
  • Status: Expired due to Term
First Claim
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1. A holographic object position and type sensing system comprising:

  • a light source for outputting a pulsed light beam comprising an object beam;

    a holographic template comprising phase patterns for receiving an object beam that is reflected from an object, and wherein the reflected object beam interferes with the phase patterns present on the template, and convolution between the beam interference and the phase pattern produces a spot of light when there is an exact match, and wherein the brightness of the spot indicates the degree of match and the location of the spot indicates the spatial location of the object;

    a two-dimensional detector array for detecting the magnitude and location of the spot and for outputting signals indicative thereof; and

    a processor for processing the signals indicative of the magnitude and location of the spot to generate and output signal indicative of the position of the object and a classification of the object, wherein the holographic template comprises a plurality of interference patterns arranged at different polarization angles around an axis through the center of the template, which plurality of interference patterns are indicative of both the classification and spatial location of the object.

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