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Object detection method and apparatus employing polarized radiation

  • US 6,342,696 B1
  • Filed: 05/25/1999
  • Issued: 01/29/2002
  • Est. Priority Date: 05/25/1999
  • Status: Expired due to Term
First Claim
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1. A method of detecting an object comprising the steps of:

  • illuminating a target with polarized radiation;

    collecting first radiation reflected from said target which has a polarization which is the same as the radiation used to illuminate said target;

    collecting second radiation reflected from said target which is oppositely polarized to that of said radiation which is used to illuminate said target; and

    comparing a difference between amplitudes of said first and second radiation with a predetermined value representative of an expected difference when the object were not present.

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