Measuring system for determining the capacitance ratio of a pair

Details Measuring system for determining the capacitance ratio of a pair Measuring system for determining the capacitance ratio of a pair

1984-02-29

1986-11-04

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

307110, G01R 2726

Patent

active

046212272

ABSTRACT:
By simultaneously charging a pair of capacitors to the same d-c voltage and then simultaneously discharging those capacitors to the same d-c reference voltage, the two discharge time durations will be functions of and will be proportional to the capacitances of the two capacitors. A comparison of those discharge time durations will thus provide an indication of the ratio of the capacitances of the two capacitors. This is achieved by including, in the measuring system, an oscillating circuit whose frequency is determined by the capacitance of one of the capacitors. A periodically-recurring rectangular wave is then developed having pulse components with pulse widths determined by the capacitance of the other capacitor, the frequency of the rectangular wave being equal to the oscillating frequency. The duty cycle of the rectangular wave is therefore proportional to and represents the ratio of the capacitances of the capacitors. By averaging the rectangular wave in a low-pass filter, an output signal is produced having an amplitude which is proportional to and represents the capacitance ratio.

REFERENCES:
patent: 3761805 (1973-09-01), Dornberger
patent: 3824459 (1974-07-01), Uchida
patent: 3886447 (1975-05-01), Tanaka
patent: 4065715 (1977-12-01), Jaffe et al.
patent: 4283676 (1981-08-01), Shaw
patent: 4404481 (1983-09-01), Ide et al.
patent: 4429272 (1984-01-01), Bungay

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