Method and apparatus for magnetic discontinuity detection in a s

Details Method and apparatus for magnetic discontinuity detection in a s Method and apparatus for magnetic discontinuity detection in a s

1987-02-19

1989-03-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324235, 324238, 324262, 36457101, G01N 2783, G01R 3306

Patent

active

048147052

ABSTRACT:
A method and an apparatus are provided for detecting magnetic discontinuities, for example corrosion pits, in a specimen of magnetizable material. A horseshoe shaped magnet (32) is supported with its poles just clear of a surface of the specimen (12) by a wheeled frame (20), and is moved over the surface. An array of sensors (48) between the poles detects the leakage flux near the surface. The signal from any one sensor at a particular location is corrected by subtracting from it the average of the signals from the same sensor at a plurality of other locations preceding and following that location. If the corrected signal exceeds a threshold value, this indicates abnormally large localized leakage flux, and so indicates metal loss from the specimen.

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