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Relative resonant frequency shifts to detect cracks

  • US 5,425,272 A
  • Filed: 11/30/1993
  • Issued: 06/20/1995
  • Est. Priority Date: 11/30/1993
  • Status: Expired due to Term
First Claim
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1. A method for determining if a part is flawed, comprising the steps of:

  • detecting frequency of at least two prominent resonant responses of said part;

    measuring frequency difference between two of said prominent resonant responses; and

    comparing said measured frequency difference between two of said prominent resonances to a predetermined unflawed part frequency difference.

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