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Crack development measuring equipment

  • US 4,364,113 A
  • Filed: 08/19/1980
  • Issued: 12/14/1982
  • Est. Priority Date: 08/23/1979
  • Status: Expired due to Term
First Claim
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1. Crack development measuring equipment for use in conjunction with a loading device in which a test piece can be clamped, and having an optical measuring tool trained on the test piece, said equipment comprising:

  • a television camera cooperating with said optical measuring tool,control means coupled to said television camera and to said loading device, for causing said loading device to load said test piece in periodic intervals, and for causing said television camera to produce a television image only between such intervals of loading,a discriminator, connected to said camera, for converting the image elements of each television image into binary pulses,a memory, connected to said discriminator, for temporarily storing the binary pulses of each television image, anda digital comparator connected to said memory and to said discriminator to compare the contents of said memory with the binary pulses of a consecutive television image, the output of said comparator being indicative of the development of a crack in the test piece.

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