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Nonlinear ultrasonic scanning to detect material defects

  • US 5,736,642 A
  • Filed: 01/08/1997
  • Issued: 04/07/1998
  • Est. Priority Date: 01/08/1997
  • Status: Expired due to Term
First Claim
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1. A method of detecting defects in a material, comprising the steps of:

  • mixing waves of a first frequency with waves of a second frequency at an interaction zone in said material to generate at least one of a difference wave and a sum wave in said interaction zone, said difference wave occurring at said first frequency minus said second frequency and said sum wave occurring at said first frequency plus said second frequency;

    measuring the amplitude of at least one of said difference wave and said sum wave; and

    computing a value defined as the amplitude of at least one of said difference wave and said sum wave divided by the product of the amplitude of the waves of said first frequency and the amplitude of the waves of said second frequency, wherein said value is an indication of defects in said interaction zone.

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