Permeability-modulated carrier referencing
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United States of America Patent
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Apr 30, 2002
Grant Date -
N/A
app pub date -
Mar 22, 2000
filing date -
Mar 22, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for measuring the inductance of a wire-loop without direct reference to any particular time-constant or frequency. Low-frequency noise induced into the wire-loop is canceled within the detector circuit and crosstalk between a plurality of adjacent wire-loops is nullified using passive transformers. New wire-loop configurations utilize the permeability-modulated carrier referencing to provide repeatable inductive signatures with less intrusive, and non-intrusive installations.
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