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Fizeau interferometer

  • US 4,643,575 A
  • Filed: 09/04/1984
  • Issued: 02/17/1987
  • Est. Priority Date: 09/04/1984
  • Status: Expired due to Term
First Claim
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1. In combination:

  • means for producing a beam of energy along a predetermined path;

    means, disposed in the predetermined path, for transmitting a first portion of the produced beam to a target and reflecting a second portion of the produced beam; and

    means, including the transmitting and reflecting means, for directing a target-reflected portion of the transmitted first beam portion and the reflected second beam portion to a detector along a common path, said directing means comprising means, disposed in the common path, for attenuating the reflected second beam portion along the common path and for coupling the target-reflected portion of the transmitted first beam portion along the common path with substantially no attenuation.

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