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Magnetostrictive stress wave sensor

  • US 20050194240A1
  • Filed: 03/05/2004
  • Published: 09/08/2005
  • Est. Priority Date: 03/05/2004
  • Status: Active Grant
First Claim
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1. A shock sensor in an automobile comprising:

  • a housing;

    a biasing magnet mounted to the housing and positioned to provide a biasing magnetic field to a giant magnetostrictive sensing element also mounted to the housing;

    a coil mounted to the housing and surrounding the giant magnetostrictive sensing element, for sensing a change in magnetic field produced by a shock wave in the giant magnetostrictive sensing element;

    a portion of the housing providing a mounting surface;

    a fastener extending between the housing and an automobile structural element to hold the mounting surface of the housing against the automobile structural element, wherein the giant magnetostrictive sensing element is directly, or through a spacer, loaded against the automobile structural element when the portion of the housing providing a mounting surface is held by the fastener against the automobile structural element; and

    wherein the housing has a portion that extends between the mounting surface and the giant magnetostrictive sensing element, that resiliently biases the giant magnetostrictive sensing element or the spacer, against the automobile structural element.

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