Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1976-06-11
1977-10-18
Kominski, John
Electricity: measuring and testing
Conductor identification or location
Inaccessible
G01R 1152, G01R 2726
Patent
active
040548333
ABSTRACT:
A system for generating a signal which is a predetermined function of the capacitance of a sensor capacitor. The system comprises a sensing network including two series capacitors, at least one being the sensor capacitor. The system further comprises a switching network, and a feedback network coupled to the sensing and switching networks. The feedback network generates a feedback signal representative of the difference in charge stored on the series capacitors from a predetermined value. The switching network cyclically interconnects the feedback and sensor networks with the feedback signal and externally applied reference potentials whereby the average charge stored on the series capacitors over each cycle is substantially equal to the predetermined value. In some embodiments, the feedback signal is a linear function of the reciprocal of capacitance of the sensor capacitor.
REFERENCES:
patent: 3165694 (1965-01-01), Young
patent: 3307398 (1967-03-01), Exon
patent: 3497801 (1970-02-01), Clower et al.
patent: 3534606 (1970-10-01), Stamler et al.
patent: 3543046 (1970-11-01), Tiffany
patent: 3553575 (1971-01-01), Shea
patent: 3824459 (1974-07-01), Uchida
patent: 3886447 (1975-05-01), Tanaka
Kominski John
Setra Systems, Inc.
Sunderdick Vincent J.
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