Capacitive thickness gauging for ungrounded elements

Details Capacitive thickness gauging for ungrounded elements Capacitive thickness gauging for ungrounded elements

1974-09-03

1976-11-02

Corbin, John K.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, G01R 2726

Patent

active

039900053

ABSTRACT:
A system for capacitively gauging distance to an element which is not in a low impedance path to ground. The gauging system operates to provide an indication of distance with the potential on the element at a defined level, typically ground. Several embodiments are presented for making this measurement. A first operates to measure distance at periodic instances when the defined potential exists. A second embodiment uses phase opposite excitation to produce a defined potential at the element either by specific placement of the element or through a feedback control over element potential. The system of the present invention may be adapted for use in capacitive thickness measurement on an ungrounded or highly resistive element.

REFERENCES:
patent: 3312892 (1967-04-01), Parnes
patent: 3418597 (1968-12-01), Smith
patent: 3523246 (1970-08-01), Hall et al.
patent: 3771051 (1973-11-01), Abbe
patent: 3775679 (1973-11-01), Abbe
patent: 3805150 (1974-04-01), Abbe

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