Electromagnetic flux leakage inspection system for ferromagnetic

Details Electromagnetic flux leakage inspection system for ferromagnetic Electromagnetic flux leakage inspection system for ferromagnetic

1983-12-27

1987-03-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324232, 324242, 324262, G01N 2783, G01R 3312

Patent

active

046493433

ABSTRACT:
An electromagnetic inspection system for detecting, in-situ, the location and character of flaws in a relatively long, thick-walled small bore tube of a heat exchanger wherein a resultant magnetic field is induced in the wall of the tube of selected direction and magnitude by the vector addition of the magnetic fields produced by two magnetic field generators, at least one of which is carried by a scanner for traversing the tube and having an array of sensors mounted in close proximity to the wall of the tube generating a unique signal as the scanner passes a flaw in the tube.

REFERENCES:
patent: 2995701 (1961-08-01), Lloyd
patent: 3056920 (1962-10-01), Herrald
patent: 3284701 (1966-11-01), Kerbow
patent: 3593122 (1971-07-01), Barton
patent: 3597678 (1971-08-01), Fearon
patent: 3913009 (1975-10-01), Panasjuk et al.
patent: 4468619 (1984-08-01), Reeves
patent: 4477776 (1984-10-01), Spierer

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