Circuit arrangement for evaluating the signal of a capacitive measuring sensor
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United States of America Patent
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Apr 11, 1995
Grant Date -
N/A
app pub date -
Jul 30, 1993
filing date -
Aug 7, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A capacitive humidity sensor circuit in which a one-shot circuit produces pulses having a pulse duration determined by the capacitance of a capacitive sensing element, the one-shot circuit being triggered by the trailing edges of pulses in a pulse train produced by a multivibrator. The multivibrator is adjustable to produce a pulse train of variable repetition rate independent of the value of the measured parameter. The pulses produced by the one-shot circuit are integrated to produce a voltage indicative of the time average value of the pulses, the voltage being supplied to an amplification and offset compensation circuit whose output signal is used to adjust the supply voltage to the multivibrator so as to effectively achieve compensation for nonlinear response of the capacitive sensing element to increasing relative humidity.
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