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Polychromatic optical strain gauge

  • US 4,939,368 A
  • Filed: 04/13/1989
  • Issued: 07/03/1990
  • Est. Priority Date: 04/13/1989
  • Status: Expired due to Fees
First Claim
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1. A method for measuring strain of an object comprising:

  • providing said object with a diffraction grating,illuminating said grating with radiation including at least two frequencies to produce an interference pattern corresponding to said frequencies,detecting at least a portion of the interference pattern corresponding to one of said frequencies, andanalyzing said interference pattern to determine strain.

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