Device for detecting the variation of a capacitive impedance hav

Details Device for detecting the variation of a capacitive impedance hav Device for detecting the variation of a capacitive impedance hav

1982-03-01

1984-09-11

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73 10, G01R 2726

Patent

active

044712952

ABSTRACT:
The invention relates to a device for measuring the variation of a capacitive impedance, the dielectric of which consists of a lubricant, provided with an oscillator that supplies a signal having a predetermined frequency to the capacitive impedance by way of a bias impedance.
The device according to the invention is characterized by a current measuring means delivering a signal depending on the current passing through the capacitive impedance to a converter the output of which delivers a direct current voltage signal coinciding with the instantaneous value of the capacitive impedance.

REFERENCES:
patent: 1960168 (1934-05-01), Schoenberg
patent: 2177528 (1939-10-01), Kidd
patent: 2662408 (1953-12-01), Ellison
patent: 2742609 (1956-04-01), Black
patent: 3609735 (1971-09-01), Dauterman
patent: 3901216 (1975-08-01), Felger
patent: 3990960 (1976-11-01), Ellison

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