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Method and System for Generating and Receiving Torsional Guided Waves in a Structure Using Wiedemann and Inverse Wiedmann Effect

  • US 20090174399A1
  • Filed: 01/07/2008
  • Published: 07/09/2009
  • Est. Priority Date: 01/07/2008
  • Status: Active Grant
First Claim
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1. A method of nondestructive testing of a structure using magnetostrictive techniques to determine defects in the structure, said method comprising the following steps:

  • first creating a permanent magnetic field at a location in said structure, said permanent magnetic field having a bias direction;

    applying a pulse of alternating current to a AC coil adjacent to said location, but perpendicular to said bias direction;

    second creating an alternating magnetic field pulse at said location from said pulse of said alternating current;

    generating a torsional guided wave from said alternating magnetic field pulse, direction of propagation of said torsional guided wave being in the same direction as said bias direction;

    reflecting said torsional guided wave off said defects in said structure;

    detecting said reflected torsional guided wave; and

    processing said detected reflected torsional guided wave to determine size and/or location of said defects.

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