Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-05-26
1983-11-15
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 713, 324 714, 324158R, G01R 3102
Patent
active
044158513
ABSTRACT:
A system of testing the continuity of electrical conductors extending through an insulating layer without contact. A flood gun irradiates one side of the body to charge the exposed conductors to a given potential. A steerable electron beam scans the front side to generate secondary electron emission from those conductors. The secondary emission is enhanced from conductors with conductivity between front side and back side as a result of the surface potential established by the rear flood beam. The secondary emission varies depending on the state of continuity in the three dimensional network of conductors and produces signals at the detector which allow clear discrimination between uninterrupted and interrupted conductors. The system is applicable for unfired ceramics where contact destroys the specimen.
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Langner Guenther O.
Pfeiffer Hans C.
International Business Machines - Corporation
Krawczewicz Stanley T.
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