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Ghost image extinction in an active range sensor

  • US 5,900,975 A
  • Filed: 10/30/1997
  • Issued: 05/04/1999
  • Est. Priority Date: 10/30/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for providing a substantially ghost-free image of a surface of an object to be range imaged, the apparatus comprising:

  • a plate beamsplitter having a first surface coated with a partially reflective coating, and a second surface coated with an anti-reflective coating; and

    a polarizing filter, oriented with respect to the plate beamsplitter so as to substantially block light of substantially incompatible polarization that has traversed the plate beamsplitter, has been reflected by the object to be range imaged, and has been reflected by the plate beamsplitter towards the polarizing filter, thereby substantially preventing the formation of a ghost image of the object to be range imaged.

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