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Double exposure interferometric analysis of structures and employing ambient pressure stressing

  • US 4,702,594 A
  • Filed: 11/15/1982
  • Issued: 10/27/1987
  • Est. Priority Date: 11/15/1982
  • Status: Expired due to Fees
First Claim
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1. A method of detecting structural anomalies in an article comprising the steps of:

  • subjecting the article to a sudden and significant change in ambient pressure so that a surface of the article is caused to progressively creep for a prolonged period of time following the pressure change; and

    during said prolonged period of time while the article continues to progressively creep, forming a successive series of double exposures on a photosensitive media of coherent light respectively reflected from each of several sections of said article surface, whereby to provide interference patterns on said photosensitive media for each of said several sections during one ambient pressure change.

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