Communications: electrical – Systems – Call station
Patent
1975-10-24
1977-08-02
Caldwell, John W.
Communications: electrical
Systems
Call station
323 93, 324 60CD, 340347SH, G08C 1900
Patent
active
040400417
ABSTRACT:
A precision capacitive shaft encoder providing a d-c signal corresponding to the angular position of a shaft. Two variable capacitances are coupled in tandem by a rotatable shaft. Each capacitor has a capacitance that varies linearly with a change in the angular position of the shaft, and the sum of the two capacitances is always constant for any angular position of the shaft. Each capacitance is alternately coupled to a reference d-c voltage and a discharge circuit. The capacitances are electrically coupled in series and the charge periodically acquired at the junction of the capacitances is a function of the position of the shaft. An error-compensating voltage is imposed on the junction when the capacitances are coupled to the reference voltages, and the junction is coupled to sample-and-hold apparatus provided with a error-correcting circuit.
REFERENCES:
patent: 2548790 (1951-04-01), Higinbotham et al.
patent: 2977536 (1961-03-01), Hindel
patent: 3059228 (1962-10-01), Beck et al.
patent: 3683402 (1972-08-01), Parnell
patent: 3702467 (1972-11-01), Melnyk
patent: 3714567 (1973-01-01), Kusters et al.
patent: 3729728 (1973-04-01), Hardway
patent: 3820095 (1974-06-01), Wojtasinki et al.
Fletcher James C. Administrator of the National Aeronautics and Space
Hruby Ronald J.
Wilson Robert L.
Brekke Darrell G.
Caldwell John W.
Groody James J.
Manning John R.
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