Surface potentiometer

Details Surface potentiometer Surface potentiometer

1978-10-31

1981-05-12

Tokar, Michael J.

Electricity: measuring and testing

Electrostatic field

Using modulation-type electrometer

G01R 2912

Patent

active

042675111

ABSTRACT:
A surface potentiometer having a measuring electrode disposed at a predetermined distance from a surface to be measured and in which the electric field between the measuring electrode and the surface to be measured is intermittently shielded by a rotatable chopper to thereby induce an AC signal in the measuring electrode and the AC signal is clamped at a timing corresponding to the position of the chopper relative to the electrode to thereby accurately measure the potential of the surface to be measured.

REFERENCES:
patent: 2820947 (1958-01-01), Gunn
patent: 3344344 (1967-09-01), Wales, Jr.
patent: 3667036 (1972-05-01), Seachman
patent: 3729675 (1973-04-01), Vosteen

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