Circuitry to minimize stray capacitance effects in a capacitive

Details Circuitry to minimize stray capacitance effects in a capacitive Circuitry to minimize stray capacitance effects in a capacitive

1994-05-11

1996-10-22

Cuchlinski, Jr., William A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

324611, 324669, 324678, G01F 2326, G01R 2726

Patent

active

055665721

ABSTRACT:
A time varying excitation current (413) is provided to one side of a capacitive sensor (417), and two signal paths (420,430) are provided between the other side of the capacitive sensor (417) and signal conditioning circuitry (412), each signal path differing from the other according to its polarity. The signal paths conduct monopolar signals from the capacitive sensor the magnitude of which are directly related to the capacitance of the sensor, and bi-polar signals the magnitude of which are directly related to the stray capacitance in the signal lines. The combined monopolar and bi-polar signal currents on each signal line are converted into voltage signals (422,433), and the voltage signals are thereafter differenced (460) to provide a null bi-polar output while providing a constant monopolar voltage level the magnitude of which is directly related to the probe capacitor current.

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CH-53 Fuel Quantity Gauging--BF Goodrich Aerospace Simmonds Precision Dated: Aug. 1993.

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