Capacitive pick-off circuit

Details Capacitive pick-off circuit Capacitive pick-off circuit

G - Physics

01

R

324/44

G01R 27/26 (2006.01) G01D 5/24 (2006.01) G01D 5/241 (2006.01) G01P 15/125 (2006.01)

Patent

CA 1119252

CAPACITIVE PICK-OFF CIRCUIT ABSTRACT OF THE DISCLOSURE An improved capacitive pick-off circuit is provided by utilizing a reference current generator to apply a square wave to a pick-off capacitor and the resulting voltage across the capacitor is then applied to a fixed capacitor. The resulting fixed capacitor current then provides a measure of the capacitance of the pick-off capacitor. A differential capacitive pick-off circuit is provided by applying the reference current to each pick-off capacitor and providing a fixed capacitor for each of the pick-off capacitors. The resulting fixed capacitor currents are combined and the resulting differential current is used as a measure of the difference in capacitance or the difference in the gaps between the plates of the capacitors.

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