Capacitively coupled ohmic resistance position sensor

Details Capacitively coupled ohmic resistance position sensor Capacitively coupled ohmic resistance position sensor

1995-06-08

1997-05-06

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Using differential pressure

34087037, G01F 122, G01F 2368

Patent

active

056273258

ABSTRACT:
A position sensor comprises a pair of electrically conducting elongated members having a high ohmic resistance per unit length thereof disposed parallel to one another in a direction defined by the line of displacement of a target member, and a capacitively coupling member disposed adjacent to the pair of electrically conducting elongated members and moving with the target member in the direction of displacement, which capacitively coupling member transmits an alternating electrical signal between the pair of electrically conducting elongated members by a capacitive electrical interaction therebetween, wherein an alternating electrical signal is supplied to the two opposite extremities of one of the pair of electrically conducting elongated members and a phase angle difference between two alternating electrical signals respectively taken off from the two opposite extremities of the other of the pair of electrically conducting elongated members is measured, and the position of the target member is determined as a function of the measured phase angle difference.

REFERENCES:
patent: 2968031 (1961-01-01), Higa
patent: 3221256 (1965-11-01), Walden
patent: 3636449 (1972-01-01), Partridge
patent: 4290065 (1981-09-01), Gleason
patent: 4560986 (1985-12-01), Lew et al.
patent: 4584885 (1986-04-01), Cadwell
patent: 4641523 (1987-02-01), Andreasson
patent: 4951506 (1990-08-01), Lew

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