Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Patent
1985-03-21
1987-07-28
Levy, Stewart J.
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
324 72, 324118, G01R 2912
Patent
active
046834362
ABSTRACT:
The surface potential electrometer includes a reciprocating chopper, a measuring electrode on which a voltage is induced which is associated with the surface potential of a member to be measured, a shield member for shielding the measuring electrode and the chopper from electric field emanating from the member to be measured, and a driver for driving the chopper, thereby detecting the surface potential of the member in the form of an AC signal. The shield member is provided with an aperture for guiding the electric field emanating from the member to the measuring electrode.
REFERENCES:
patent: 3195037 (1965-07-01), Van Nie
patent: 3370225 (1968-02-01), Winder
patent: 4149119 (1979-04-01), Buchheit
patent: 4205267 (1980-05-01), Williams
patent: 4266870 (1981-05-01), Eda et al.
Canon Kabushiki Kaisha
Levy Stewart J.
O'Shea Kevin D.
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