Surface electric potential sensor

Details Surface electric potential sensor Surface electric potential sensor

1985-11-27

1988-01-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrostatic field

Using modulation-type electrometer

324457, G01R 2912

Patent

active

047206829

ABSTRACT:
A surface electric potential sensor for detecting an electric potential on a surface of an object without contacting the surface. The sensor comprises a tuning fork having a base and legs formed of a single elastic body, piezoelectric vibrators respectively mounted on the legs, double-layer structure electrodes respectively provided on ends of the legs and each comprising an insulating substrate and a high conductive film, a supporting board, and a shield case which has a window for introducing therethrough lines of electric force radiated from the surface of the object. The tuning fork is mounted at the base on the upper surface of the supporting board. An electric circuit may be also mounted on the upper surface of the supporting board. As the tuning fork is vibrated by the piezoelectric vibrators, the electrodes moves so as to open and close the window of the shield case.

REFERENCES:
patent: 4147981 (1979-04-01), Williams
patent: 4205267 (1980-05-01), Williams
Yokoyama, Masaaki and Mikawa, Hiroshi, "On Manufacture of a Simple Processor for Surface Potential", Journal of Society of Electrophotography of Japan, Jan. 22, 1983, pp. 52-55.
"Surface Potential Sensor", NEC Technical Journal, vol. 36, No. 1/1983, p. 132.

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