A.C. capacitive gauging system
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United States of America Patent
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-
Apr 17, 1990
Grant Date -
N/A
app pub date -
Apr 17, 1990
filing date -
Mar 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A compensated capacitive probe system in which the probe and a guard ring are placed in the feedback path of an operational amplifier. An input signal is applied to the operational amplifier in combination with a portion of the guard signal. The resulting configuration compensates for stray capacitance at a measuring electrode of the probe and for the fact that the operational amplifier is other than mathematically ideal.
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