Inductive sensory apparatus
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United States of America Patent
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Apr 20, 2004
Grant Date -
Jun 27, 2002
app pub date -
Dec 21, 2000
filing date -
Dec 21, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An inductive sensory system generally includes a sense inductor, a reference sense inductor, an oscillator, a feedback control loop, and a comparator. The oscillator is connectable to both the sense inductor and the reference sense inductor. Upon the oscillator being connected to the reference sense inductor, the feedback control loop establishes a fixed reference level. Upon the sense inductor being connected to the oscillator, the comparator compares the state of the sense inductor against a threshold that is derived from the fixed reference level to determine the change in inductance of the sense inductor.
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