Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Patent
1986-11-10
1988-02-09
Karlsen, Ernest F.
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
324 72, 324109, 324132, 324140D, G01R 528, G01R 2912
Patent
active
047243937
ABSTRACT:
A surface potential detector of a non-contact type which comprises first and second detecting electrodes arranged in a separated manner from a measured surface so that charge variations are induced on the first and second detecting electrodes on the basis of the potential of the measured surface. The surface potential detector further comprises apparatus for making the amounts of charge variations induced on the first and second detecting electrodes different from each other, first and second detecting devices respectively detecting the amounts of charge variations induced on the first and second detecting electrodes and correction apparatus for performing arithmetic on the ratio between the outputs from the first and second detecting devices to correct the output of the first or second detecting devices on the basis of the ratio.
REFERENCES:
patent: 4205267 (1980-05-01), Williams
patent: 4222007 (1980-09-01), Comstock
patent: 4614908 (1986-09-01), Daniele et al.
Kumada Akira
Murata Michihiro
Karlsen Ernest F.
Murata Manufacturing Co. Ltd.
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