Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-06-02
1977-04-19
Tung, J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
204 1T, 204195R, 324 51, 324 52, G01N 2746, G01N 3102
Patent
active
040191290
ABSTRACT:
Apparatus for determining the presence, quantity, size, and location of corrosion causing pores and insulating films on metallic platings is described herein. With the plating acting as an anode, a coordinate array of electrochemical cells is formed by placing an electrolytic film on the plating and sequentially energizing a coordinate array of cathode conductors in the film. A digital voltmeter is connected to the plating anode and registers varying potentials as the cathode conductors are energized depending upon the presence, etc., of pores in and films on the plating. Information derived from the voltmeter output controls a printer, in one embodiment, to record the sequential output information. Correlation of the recorded information with the sequence in which the cathode conductors are energized indicates the location of the undesirable plating surface conditions.
REFERENCES:
patent: 2894882 (1959-07-01), Strodtz
patent: 2960455 (1960-11-01), Frankenthal
patent: 2962426 (1960-11-01), Sharpsteen
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patent: 3356597 (1967-12-01), Schmidt
patent: 3494837 (1970-02-01), Messner et al.
patent: 3551801 (1970-12-01), Wood et al.
patent: 3719884 (1973-03-01), Laroche
patent: 3806800 (1974-04-01), Bove et al.
patent: 3808105 (1974-04-01), Rozeanu
Bell Telephone Laboratories Incorporated
Kamstra William H.
Tung J.
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