Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1988-10-06
1990-01-16
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324158R, 324457, 324458, 350356, G01R 2316, G02F 103
Patent
active
048946079
ABSTRACT:
A surface potential detecting apparatus includes an electro-optical crystal element (22), wherein an electric field from a surface to be measured is directly or indirectly applied to a measuring electrode (24) of the electro-optical crystal element, and an alternating voltage which is obtained by stepping up an oscillating voltage generated in an oscillating circuit (35) is applied to a reference electrode (25) of the element from a step up circuit (34). Light which passes through the electro-optical crystal element is received by a photosensitive unit (30). Zero electric field is detected (31) based on the output of the photo sensitive unit, and a trigger signal is held in a hold circuit (32). An output circuit (33) outputs the held voltage. Therefore, in this surface potential detecting apparatus, the detecting precision is not degraded by mechanical factors, the detection output is not dependent on the distance to the surface whose potential is being detected, and the potential of the surface to be measured can be measured in a no-contact manner at high speed.
REFERENCES:
patent: 3639771 (1972-02-01), Borrelli et al.
patent: 3700912 (1972-10-01), Glass et al.
patent: 4465969 (1984-08-01), Tada et al.
patent: 4786858 (1988-11-01), Haas et al.
Karlsen Ernest F.
Murata Manufacturing Co. Ltd.
Nguyen Vinh P.
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