Method and apparatus for nondestructive inspection of magnetic p

Details Method and apparatus for nondestructive inspection of magnetic p Method and apparatus for nondestructive inspection of magnetic p

1986-06-02

1988-06-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

G01N 2787, G01N 2790

Patent

active

047514604

ABSTRACT:
Method and apparatus for nondestructive inspection of oilfield piping includes first and second pole pieces and a electromagnetic core therebetween for emitting a unidirectional magnetic flux field into the piping. A plurality of detector shoes each house a flux leakage coil assembly and a corresponding eddy current coil assembly. Circuits receive, process and transmit signals from the individual flux leakage coil assemblies to the surface. At the surface each signal is processed individually to provide indications of mass loss and/or gain as detected by each flux leakage coil assembly.

REFERENCES:
patent: 3225293 (1965-12-01), Wood et al.
patent: 3543144 (1970-11-01), Walters et al.
patent: 3786684 (1974-01-01), Wiers et al.
patent: 3940689 (1976-02-01), Johnson, Jr.
patent: 3967194 (1976-06-01), Beaver et al.

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