Differential capacitance detector

Details Differential capacitance detector Differential capacitance detector

1995-08-23

1998-03-10

Brown, Glenn W.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324658, G01R 2726, G01N 2722

Patent

active

057265798

ABSTRACT:
A differential capacitance detector comprises an integrator which has a difference between a capacitance (C.sub.S) of a sensor having the capacitance corresponding to physical or chemical quantities of an object for detection and a reference capacitance (C.sub.R) as constants, and an oscillation circuit which determines an oscillation frequency by the difference between the two capacitances (C.sub.S and C.sub.R). The differential capacitance detector can detect or measure various kinds of physical or chemical quantities, even if the change of sensor capacitance is small.

REFERENCES:
patent: 3753373 (1973-08-01), Brown
patent: 3757210 (1973-09-01), Hansen et al.
patent: 4011500 (1977-03-01), Pelletier et al.
patent: 4167697 (1979-09-01), Gerber
patent: 4716361 (1987-12-01), Sheffer
patent: 5073757 (1991-12-01), George
patent: 5317274 (1994-05-01), Nakagawa et al.
patent: 5553479 (1996-09-01), Rauchwerger

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