Devices designed to measure locally the electric charges carried

Details Devices designed to measure locally the electric charges carried Devices designed to measure locally the electric charges carried

1983-03-17

1985-11-12

Karlsen, Ernest F.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

324 72, 324452, 324457, G01N 2700

Patent

active

045530890

ABSTRACT:
In order to measure the values of the electrical charges (2) carried by a surface S of a dielectric sheet (1), one uses a device consisting of a first electrode or probe (S) facing the surface S, a second electrode (4) applied against the back surface of this sheet, means (F) to displace laterally the probe with respect to the sheet and means (5) to measure the charges (6) induced on this probe.
In addition, by means of acoustical, optical or electrical methods, one subjects the surface S to deformation localized in very small spots p (of an area inferior to the one defining the spatial resolution of the measurement) during very short times and repeatly at frequence high enough and in such a way as to have some overlapping of the spots sequentially deformed.

REFERENCES:
patent: 4106107 (1978-08-01), Goodman

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