Variable capacitance

Details Variable capacitance Variable capacitance

1989-07-20

1990-04-03

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

361326, H01G 512, H01G 402

Patent

active

049145436

ABSTRACT:
A variable area capacitance transducer for measurement of length and displacement is disclosed. The preferred embodiment uses three concentric cylinders. The innermost cylinder acts as a working electrode, the middle cylinder acts as a common electrode, and the outer cylinder, a reference electrode. A movable concentric cylinder acts as a shield and is guided for movement between the working and common electrodes. The capacitance of the transducer is related to the displacement of the shield.

REFERENCES:
patent: 2344239 (1944-03-01), Finch
patent: 3566222 (1971-02-01), Wolfendale et al.
patent: 3570003 (1971-03-01), West
patent: 3702957 (1972-09-01), Wolfendale

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