Method and circuitry for measuring the impedance of a sensor
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United States of America Patent
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Feb 5, 1985
Grant Date -
N/A
app pub date -
May 11, 1982
filing date -
May 18, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of measuring the impedance of a sensor by applying a sine-shaped AC voltage and transforming the response signal proportional to said impedance into a DC voltage such that even for very little measured voltage highest linearity is present. The method comprises the steps of generating a square wave voltage together and in synchronism with said AC voltage, applying said AC voltage to said sensor impedance, filtering the resulting AC voltage and bringing it into a defined phase relation to the square wave and rectifying the AC voltage by means of a switch controlled by said square wave. The rectifier circuit is a low-pass circuit having a grounded resistor which by said switch intermittedly is short-circuited.
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