High speed D.C. non-contacting electrostatic voltage follower

Details High speed D.C. non-contacting electrostatic voltage follower High speed D.C. non-contacting electrostatic voltage follower

1989-09-06

1990-05-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Testing potential in specific environment

Voltage probe

324109, 324458, 324 725, 355216, G01R 104, G01R 1067

Patent

active

049280570

ABSTRACT:
A non-contacting electrostatic voltage follower comprising a detector electrode sensitive to electrostatic quantities such as electrostatic fields, voltages, charges and the like, a modular coupled to the electrode for modulating the capacitance coupling between the electrode and a surface bearing an electrostatic quantity to which the electrode is exposed, a detector amplifier of the current summing type having the summing input thereof connected to the detector electrode, and a high bandwidth amplifier having an input connected to the output of the detector amplifier. A probe comprises a transparent carrier element coupled to the modulator, a first conductive and transparent film on a surface of the carrier and defining the detector electrode, and a second film of conductive and transparent material on the remainder of the surface of the carrier and spaced from the first film. The carrier is disposed in a path for radiation onto the surface for irradiating a region of the surface in registry with the electrode and in a manner such that compensation is made for capacitive fringing effects by allowing for radiation of the fringing areas of the surface coupled to the detector electrode by fringing capacitance.

REFERENCES:
patent: 4367948 (1983-01-01), Suzuki
patent: 4625176 (1986-11-01), Champion et al.
patent: 4835461 (1989-05-01), Snelling

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