Electrostatic capacitance sensing circuit

Details Electrostatic capacitance sensing circuit Electrostatic capacitance sensing circuit

1991-01-02

1992-09-22

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324682, 340620, G01N 2722

Patent

active

051500620

ABSTRACT:
The electrostatic capacitance sensing circuit comprises a resonance circuit composed of an electrode capacitance formed by a substance to be measured and sandwiched between two opposing electrode plates and an inductance at least part of which is connected in parallel to the electrode capacitance; an active element (e.g. transistor) for constituting an oscillator in cooperation with the resonance circuit; and in particular a capacitor connected between the resonance circuit and the active element. Since a dc bias voltage of the active element is substantially not applied to the electrode plates, it is possible to prevent electrolytic corrosion of the electrode plates due to electromotive force generated between the electrode plates when ions are resolved into the substance to be measured and therefore the substance changes to an electrolytic solution.

REFERENCES:
patent: 3046479 (1962-07-01), Mead
patent: 3714560 (1973-01-01), Farr
patent: 4002996 (1977-01-01), Klebanoff
patent: 4050016 (1977-09-01), Marsh

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