Capacitance sensing system using multiple capacitances to sense

Details Capacitance sensing system using multiple capacitances to sense Capacitance sensing system using multiple capacitances to sense

1988-06-30

1989-09-05

Eisenzopf, Reinhard J.

Communications: electrical

Continuously variable indicating

With particular transmitter

324 61R, 341 15, G08C 1910, G08C 1916

Patent

active

048642959

ABSTRACT:
A capacitance sensing system for sensing the rotary position of a rotating shaft, particularly one having limited rotary motion. The system uses at least four capacitances comprising fixed capacitance plate members, one of which is preferably made of four arcuate segments enclosing the shaft and the other of which is a ring member enclosing the shaft and displaced therefrom along the shaft. A dielectric member is attached to the shaft between the fixed plate members. The capacitance value of the four capacitances change as the shaft rotates in such a manner that the capacitance changes produce an output voltage which represents the rotary position of the shaft, which output voltage is insensitive to radial motions of the shaft.

REFERENCES:
patent: 3238523 (1966-03-01), Masel et al.
patent: 3421371 (1969-01-01), Williams, Jr.
patent: 3732553 (1973-05-01), Hardway, Jr.
patent: 4238781 (1980-12-01), Vercellotti et al.

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