Alternating voltage method of electrically detecting damage to a

Details Alternating voltage method of electrically detecting damage to a Alternating voltage method of electrically detecting damage to a

1975-03-24

1976-06-22

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3112

Patent

active

039654150

ABSTRACT:
A tantalum electrode is provided on a probe dipping into the electrically conducting contents of a reaction vessel of which the steel shell is protected by an enamel layer pierced by one or more protective tantalum plugs and an alternating voltage is applied between the tantalum electrode and the metallic shell of the reaction vessel. Both the electrode and the plug or plugs are provided with a passivating layer by the resulting alternating current and when these layers are formed the current stops except that it continues or starts again when there is a defect in the enamel layer. Very small currents can be used since the a-c component can be filtered and amplified for reliable detection.

REFERENCES:
patent: 2551479 (1951-05-01), Wallace
patent: 2555937 (1951-06-01), Rosenthal et al.
patent: 2651751 (1953-09-01), Heath
patent: 3210655 (1965-10-01), McGlasson et al.
patent: 3555414 (1971-01-01), Deichelmann
patent: 3719884 (1973-03-01), Laroche
patent: 3831085 (1974-08-01), Kratavil

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