Moisture sensor having low sensitivity to conductance changes
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United States of America Patent
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Jan 12, 1999
Grant Date -
N/A
app pub date -
Jan 8, 1997
filing date -
Jan 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensing device includes a pair of sensing electrodes disposed within a medium and a circuit connected to the sensing electrodes via impedance matching networks for producing an output signal which varies in response to a capacitive change in the medium. The circuit includes a first circuit portion including the sensing electrodes and a second circuit portion including the oscillator. The first and second circuit portions are tuned to match their impedance for more accurately measuring the capacitive changes.
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