Apparatus for and method of monitoring the corrosion in electric

Details Apparatus for and method of monitoring the corrosion in electric Apparatus for and method of monitoring the corrosion in electric

1984-05-22

1987-03-24

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324233, 324262, G01N 2790, G01R 3312

Patent

active

046528237

ABSTRACT:
A metal cable corrosion monitor comprises a sensing head (14) located about a multi strand cable (1). The sensing head includes a field windings (3) for applying a magnetic field coaxially to a portion of the cable to be monitored. A pick-up coil (2) encircles the portion and detects magnetic flux parallel with the cable and linking with the area of the pick-up coil. The signals from the pick-up coil are processed by a high gain amplifier (8) and phase sensitive detectors (7) and (6), the former phase sensitive detector producing an output in phase with the field winding driving frequency and the latter phase sensitive detector producing a quadruture output relative to the field winding driving frequency. By observation of the amplitude and the phase output parameters it is possible to detect corrosion of a single or multi strand cable. A particular format of field winding is disclosed whereby the effects of induced inter strand currents can be reduced.

REFERENCES:
patent: 2806992 (1957-09-01), Foerster
patent: 3281668 (1966-10-01), Rosner et al.
patent: 3731184 (1973-05-01), Goldberg et al.
patent: 4292589 (1981-09-01), Bonner
patent: 4335352 (1982-06-01), Stephen
patent: 4388593 (1983-06-01), Mittleman
patent: 4495465 (1985-01-01), Tomaiuolo et al.
patent: 4546316 (1985-10-01), Lang
"New Method for Steel Cable Testing Developed at NTH", Berqverks-Nytt (Norwegiar Publication), 7-8/1969, pp. 13-17.

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