Surface electric potential sensor drive and induction noise canc

Details Surface electric potential sensor drive and induction noise canc Surface electric potential sensor drive and induction noise canc

1995-03-06

1997-02-04

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Parameter related to the reproduction or fidelity of a...

324457, 324458, 324 72, G01R 2912, G01R 528

Patent

active

056002513

ABSTRACT:
Surface potential is detected with high precision by removing induction noise generated by a drive circuit and transmitted to a detection electrode. Induction noise imparted by a drive circuit to an A.C. voltage signal is cancelled out by supplying an output of a pre-amplifier for amplifying the A.C. voltage signal derived from a detection electrode and an output of the drive circuit for applying a drive signal to a chopper portion to a differential amplifier and differentially amplifying them. Particularly, an attenuator for making a level of the amplified A.C. voltage signal substantially coincident with a level of a signal from the drive circuit and an inverter/amplifier for making phase deviation coincident are provided in an output portion of the pre-amplifier circuit.

REFERENCES:
patent: 4613228 (1986-09-01), Suzuki et al.
patent: 4649336 (1987-03-01), Bindner et al.
patent: 4683436 (1987-07-01), Suzuki
patent: 4720682 (1988-01-01), Ikushima et al.
patent: 4724393 (1988-02-01), Kumada et al.
patent: 4853639 (1989-08-01), Vosteen et al.

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