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Method for measuring stress/strain using Barkhausen noises

  • US 7,317,314 B2
  • Filed: 08/16/2003
  • Issued: 01/08/2008
  • Est. Priority Date: 08/20/2002
  • Status: Expired due to Fees
First Claim
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1. A method of measuring stress/strain of magnetic or magnetizable elements by detecting Barkhausen noise, comprising:

  • arranging an exciting/sensing device at least adjacent to said element;

    applying a continuously rising magnetizing current to the exciting device;

    detecting starting of Barkhausen noise by means of the sensing device;

    determining magnitude of the magnetizing current when the Barkhausen noise starts;

    comparing the determined magnitude of the magnetizing current when the Barkhausen noise starts with measured reference values to determine the stress/strain condition of the element; and

    outputting a signal representing the determined stress/strain condition of the element.

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