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One-time sensor device

  • US 8,485,723 B2
  • Filed: 08/10/2010
  • Issued: 07/16/2013
  • Est. Priority Date: 08/12/2009
  • Status: Active Grant
First Claim
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1. A sensor assembly operable for sensing a predetermined condition, said sensor assembly comprising:

  • a sensor unit including;

    an elongated, resilient sensor element;

    a support for said sensor element;

    structure releasably holding said sensor element in a first configuration on said support,said sensor element operable to assume a second configuration different than said first configuration when said condition occurs; and

    a detector separate from said sensor element and including a transmitter unit operable to transmit interrogating electromagnetic radiation to said sensor element,said sensor element having a first response to said radiation when the sensor element is in said first configuration, and a second response different from said first response when the sensor element is in said second configuration,said sensor element comprising an amorphous or nanocrystalline sensor microwire having a positive magnetostriction property, said first and second responses being respective remagnetization responses;

    said detector operable to detect the difference between said first and second responses.

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