Physical displacement sensing with differential capacitor

Details Physical displacement sensing with differential capacitor Physical displacement sensing with differential capacitor

1974-12-16

1977-03-08

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

307234, 328133, G01R 2726

Patent

active

040115003

ABSTRACT:
A device for measuring spatial displacement comprises two similar elementary capacitors of a differential capacitor and which share a common movable armature and the two capacitors are used to produce respective pulses whose lengths are compared to produce a third pulse whose length is proportional to the displacement of the armature. In a preferred embodiment, the capacitors are switched in alternation into an oscillating circuit and serve to determine the frequency of oscillation thereof and the time taken for a fixed number of oscillations to be produced with each capacitor switched in is measured to produce the first and second pulses. An adder/subtractor counter is provided which provides a fourth pulse whose length is equal to twice that of the first pulse and the fourth pulse is compared with a pulse whose length equals the sum of the first and second pulses to produce the third pulse.

REFERENCES:
patent: 2877416 (1959-03-01), Grisdale
patent: 2968031 (1961-01-01), Higa
patent: 3219925 (1965-11-01), Borley et al.
patent: 3222591 (1965-12-01), Mynall
patent: 3312892 (1967-04-01), Parnes
patent: 3452274 (1969-06-01), Povey
patent: 3469196 (1969-09-01), Cowin et al.
patent: 3805156 (1974-04-01), Norton et al.
patent: 3845377 (1974-10-01), Shimotori

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