Method and means for determining a measure of the surface potent

Details Method and means for determining a measure of the surface potent Method and means for determining a measure of the surface potent

1986-06-27

1989-01-24

Strecker, Gerard R.

Electricity: measuring and testing

A material property using electrostatic phenomenon

Corona induced

250325, 324457, 355 14CH, G01R 2912

Patent

active

048003379

ABSTRACT:
A medium to be charged is conveyed past a corona charging device, so that charge emitted by the corona charging device is deposited on the medium surface. A measuring wire disposed between the medium and the corona charging device, but positioned near the medium, collects a part of the emitted charge. A first measuring circuit is used to determine a measure i.sub.d of the charge current collected by the measuring wire. A second measuring circuit determines a measure i.sub.f of that part of the emitted charge current that flows to the medium. In accordance with a predetermined relation, a value E of the surface potential is derived from these measures i.sub.f and i.sub.d.

REFERENCES:
patent: 4189642 (1980-02-01), Sustus et al.
patent: 4417804 (1983-11-01), Werner, Jr.
patent: 4433298 (1984-02-01), Palm

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