Capacitive dimensional measurement chain with linear output

Details Capacitive dimensional measurement chain with linear output Capacitive dimensional measurement chain with linear output

1989-12-01

1991-11-12

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324684, 324688, G01R 2726

Patent

active

050651056

ABSTRACT:
A capacitive dimensional measurement chain with linear output is essentia comprised of a capacitive sensor formed by a central detection electrode and a guard electrode surrounding the detection electrode that are respectively powered by two a.c. bias voltage sources. The chain also comprises a reference capacitor and a measuring circuit for measuring the distance between the detection electrode and a conductive part placed facing the detection electrode. The bias voltage sources are variable level sources and are level-controlled by a distance measurement signal issued by the measuring circuit. The measuring circuit comprises a level amplifier and a demodulator for amplifying and demodulating an incoming error signal representative of a difference between a load of a sensor capacitance that is defined between the detection electrode and the part separated by the distance to be measured, and a load of the reference capacitor. The distance measurement signal supplied by the measuring circuit linearly represents the distance to be measured.

REFERENCES:
patent: 4067225 (1978-01-01), Dorman et al.
patent: 4176555 (1979-12-01), Dorman
patent: 4539835 (1985-09-01), Shambroom et al.

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