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Dynamic interferometer controlling direction of input beam

  • US 6,987,569 B2
  • Filed: 08/23/2002
  • Issued: 01/17/2006
  • Est. Priority Date: 08/23/2001
  • Status: Expired due to Fees
First Claim
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1. An interferometry system, comprising:

  • an interferometer which during operation receives an input beam, separates the input beam into a measurement beam and another beam, directs the measurement beam to contact a measurement object, and overlaps the measurement beam after it reflects from the measurement object with the other beam to form an output beam, wherein the measurement object and interferometer are configured to move relative to each other;

    a beam steering assembly having a beam steering element positioned to direct the input beam into the interferometer and to not contact the output beam, and an electronic positioning system to selectively orient the beam steering element relative to the interferometer; and

    a control circuit coupled to the positioning system which during operation causes the positioning system to reorient the beam steering element in response to a change in the angular orientation of the measurement object relative to the interferometer.

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