Capacitive displacement measuring device with T-shaped scale coa

Details Capacitive displacement measuring device with T-shaped scale coa Capacitive displacement measuring device with T-shaped scale coa

1984-11-09

1991-11-26

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With particular transmitter

324161, 324659, G08C 1910

Patent

active

050686534

ABSTRACT:
A capacitance length and/or angle measuring device has a transducer comprising a stationary part (1) forming a scale and a part (2) displaceable parallel over the surface of the scale, at a short distance therefrom and acting as a sensing unit. The opposite surfaces of the scale and sensing unit are provided with capacitor coatings (5,6,7,8,9). The mechanical quantity to be measured causes an area vibration of a capacitor, the capacitance variation resulting therefrom acting as a variable capacitive reactance in a circuit, which changes the phase position of the electrical signals. With an appropriate configuration of the capacitor surfaces one obtains a linear function between the mechanical quantity to be measured and the phase portion of the signals.

REFERENCES:
patent: 3146394 (1964-08-01), Frisch
patent: 3221256 (1965-11-01), Walden
patent: 3348133 (1967-10-01), Wolfendale
patent: 3845377 (1974-10-01), Shimotori
patent: 3961318 (1976-06-01), Farrand
patent: 4223300 (1980-09-01), Wiklund
patent: 4242666 (1980-12-01), Reschovsky
patent: 4339709 (1982-07-01), Brihier
patent: 4562430 (1985-12-01), Robinson
patent: 4573048 (1986-02-01), Dash

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