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Multibit bimorph magnetic tags using acoustic or magnetic interrogation for identification of an object coupled thereto

  • US 5,552,778 A
  • Filed: 11/23/1994
  • Issued: 09/03/1996
  • 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 magnetostrictive strip fixedly mounted on a bar of material to form at least one bimorph for being excited in an oscillatory field,each said at least one bimorph responding to the oscillatory field by vibrating in a bending mode perpendicular to the plane of the interface formed by said at least one magnetostrictive strip mounted on said bar of material, to produce a unique time varying acoustic or magnetic field when said excitation has a frequency corresponding to a resonant frequency of said bar of material.

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