Method and circuitry for measuring the impedance of a sensor

Details Method and circuitry for measuring the impedance of a sensor Method and circuitry for measuring the impedance of a sensor

1982-05-11

1985-02-05

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 57R, 324436, 324442, G01R 2702

Patent

active

044980442

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.

REFERENCES:
patent: 4160205 (1979-07-01), Hobbs et al.

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