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Compact fiber optic electronic laser speckle pattern interferometer

  • US 6,043,870 A
  • Filed: 07/01/1997
  • Issued: 03/28/2000
  • Est. Priority Date: 07/01/1996
  • Status: Expired due to Term
First Claim
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1. An electronic speckle-pattern interferometry system based upon an in-plane displacement sensitive optical configuration, comprising:

  • a thermal stressing unit operative to provide a slight temperature differential between a localized region and a surrounding area of an object under inspection;

    a source of coherent optical radiation directed toward the object;

    an optical fiber configured to receive radiation from the source, including a fiber stretcher to implement a phase-stepping technique for quantitative fringe analysis;

    means for receiving and combining an image of the object with the output of the fiber stretcher so as to generate a fringe pattern characteristic of flaw-induced anomalies; and

    a display device upon which to view the fringe pattern.

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