Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-06-07
1979-01-09
Tokar, M.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 65CR, 324118, 324127, G01N 2742
Patent
active
041340590
ABSTRACT:
The invention relates to a method and apparatus for measuring the corrosion current of an elongated structure immersed in a fluid and provided with a cathodic protection device, the apparatus comprising at least one closed magnetic circuit immersed in the fluid and orientated so that a certain amount of electric current can pass therethrough, a coil on this magnetic circuit, measuring means connected to the terminals of this coil and modulation means (perforated rotating disc) for periodically varying, in time, the quantity of electric current circulating through the magnetic circuit. The invention is applied more particularly to the surveillance of underwater pipe-lines.
REFERENCES:
patent: 2297568 (1942-09-01), Leonardon
patent: 2802182 (1957-08-01), Godshalk et al.
patent: 2820947 (1958-01-01), Gunn
patent: 2839722 (1958-06-01), Marsh
Societe Intersub Developpement
Tokar M.
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