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Magnetic tag using acoustic or magnetic interrogation

  • US 5,565,847 A
  • Filed: 11/23/1994
  • Issued: 10/15/1996
  • Est. Priority Date: 11/23/1994
  • Status: Expired due to Term
First Claim
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1. A magnetic tag for being remotely sensed, comprising:

  • at least one soft magnetic element mounted for being excited in an inhomogeneous magnetic field, said at least one soft magnetic element having first and second ends and being clamped at at least one of said first and second ends, wherein no part of said at least one soft magnetic element other than said at least one of said first and second ends is clamped,each said at least one soft magnetic element responding to said excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited by an energy field which includes at least one distinct frequency corresponding to the resonant frequency of said magnetic element.

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