Reactance measurement circuit

Details Reactance measurement circuit Reactance measurement circuit

1981-01-23

1983-05-03

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73701, 73724, 331 65, G01L 912

Patent

active

043816770

ABSTRACT:
A circuit for measuring the reactance of an AC reactance sensor which varies responsive to a condition to be sensed, such as pressure, is disclosed. The circuit comprises an oscillator coupled to the sensor for providing a time varying oscillator signal having a variable frequency and a substantially constant peak to peak voltage to the sensor, and a plurality of rectifiers coupled to the oscillator and to the sensor for providing the oscillator signal as a charging signal to the sensor and for providing discharging signals from the sensor, the discharging signals being a function of the reactance of the sensor, and an amplifier coupled to the rectifiers and to the oscillator for providing an input control signal to the oscillator to control the frequency of the oscillator signal as a function of the reactance of the sensor.

REFERENCES:
patent: 3271669 (1966-09-01), Lode
patent: 3646538 (1972-02-01), Frick
patent: 3718856 (1973-02-01), Hendricks
patent: 3965746 (1976-06-01), Rabek
patent: 3975719 (1976-08-01), Frick

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