Magnetic tag using acoustic or magnetic interrogation
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United States of America Patent
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Oct 15, 1996
Grant Date -
N/A
app pub date -
Nov 23, 1994
filing date -
Nov 23, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A tag structure suitable for attachment to an object and for being remotely sensed, includes at least one soft magnetic element mounted for being excited in an inhomogeneous magnetic field. The soft magnetic element includes first and second ends and is clamped at at least one of the first and second ends. Each soft magnetic element responds to the excitation to produce a unique, time-varying magnetic field corresponding to its resonant frequency, when excited. A system incorporating the tag includes an excitation device and a detector for detecting the mechanical vibrations of the soft magnetic element.
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