Magnetic flaw detector for use with ferromagnetic small diameter

Details Magnetic flaw detector for use with ferromagnetic small diameter Magnetic flaw detector for use with ferromagnetic small diameter

1992-05-14

1994-03-08

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324232, 324242, G01N 2772, G01N 2782, G01R 3312

Patent

active

052931170

ABSTRACT:
A magnetic flaw detector for use in small-diameter tubular goods employs a second magnetic field to confine a first magnetic field to reside within a desired volumetric region in the wall of a specimen under test. A flux leakage detector and a variable reluctance sensor provide means for detecting and discriminating between defects on the inner and outer surfaces of the specimen.

REFERENCES:
patent: 3091733 (1963-05-01), Fearon et al.
patent: 4088946 (1978-05-01), Charles et al.
patent: 4447777 (1984-05-01), Sharp et al.
patent: 4602212 (1986-07-01), Hiroshima et al.
patent: 4789827 (1988-12-01), Bergander
Full Signature Multiple-Channel Vertilog, G. W. Adams et al., Society of Petroleum Engineers, May 1991.

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