Electrostatic capacitor type sensing device

Details Electrostatic capacitor type sensing device Electrostatic capacitor type sensing device

1989-08-18

1990-07-24

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

H01G 700

Patent

active

049438891

ABSTRACT:
An electrostatic capacitance type detecting device which includes a first electrode placed in the proximity of an object to be measured, a second electrode placed in the proximity of the first electrode, a film like dielectric member interposed between the first and the second electrodes, a first resistor one end of which is connected to one end of the first electrode, a second resistor one end of which is connected to one end of the second electrode, an a. c. signal generator connected to the other ends of the first and the second resistors and to the ground and a phase difference detecting means connected to the first and the second electrodes.

REFERENCES:
patent: 3918306 (1975-11-01), Maltby
patent: 4295370 (1981-10-01), Bristol
patent: 4296630 (1981-10-01), Jung et al.
patent: 4486811 (1984-12-01), Kamiya et al.

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