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Wireless monitoring and identification using spatially inhomogeneous structures

  • US 6,472,987 B1
  • Filed: 07/14/2000
  • Issued: 10/29/2002
  • Est. Priority Date: 07/14/2000
  • Status: Expired due to Fees
First Claim
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1. A method of sensing information, the method comprising the steps of:

  • a. providing-a magnetically responsive element having a length;

    b. varying, along the length of the element, the responsiveness of the element to an applied field in a spatial pattern corresponding to the information, such that a propagation rate of a magnetic response along the length will vary in accordance with the spatial pattern;

    c. subjecting the element to an applied field to induce the magnetic response therein; and

    d. sensing changes in the response propagation rate to recover the spatially-encoded information.

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