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In-situ large area optical strain measurement using an encoded dot pattern

  • US 7,377,181 B2
  • Filed: 03/10/2006
  • Issued: 05/27/2008
  • Est. Priority Date: 03/10/2006
  • Status: Active Grant
First Claim
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1. A method of measuring strain in a test specimen, the method comprising the steps of:

  • placing a pattern of marks on a surface of the test specimen, wherein the pattern of marks includes a plurality of target marks and a plurality of sets of coded marks, each set of coded marks defining a code that identifies a location of one of the target marks;

    using the sets of coded marks to identify locations of at least two of the target marks; and

    using a change in distance between at least two of the marks to determine strain in the test specimen.

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