Optical detection system

  • US RE43,681 E1
  • Filed: 10/17/2011
  • Issued: 09/25/2012
  • Est. Priority Date: 03/10/1967
  • Status: Expired due to Term
First Claim
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1. The method of detecting an uncooperative optical system including a focusing means and a surface exhibiting some degree of reflectivity disposed substantially in the focal plane of said focusing means, said method comprisingthe step of directing optical energy at said optical system whereby that portion of said energy incident upon said optical system is retroreflected with an optical gain to thereby form a beam of retroreflected optical energy, andthe step of detecting said retroreflected optical energy having a radiant flux density in excess of a preselected value to thereby indicate the presence of said optical system.

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