Inspection apparatus for electromagnetically detecting flaws in

Details Inspection apparatus for electromagnetically detecting flaws in Inspection apparatus for electromagnetically detecting flaws in

1981-10-26

1985-04-09

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324240, 324262, G01N 2772, G01R 3312

Patent

active

045104476

ABSTRACT:
Apparatus for detecting flaws in the wall of a ferromagnetic pipe is disclosed. The apparatus comprises an electromagnetic having poles in slideable contact with the surface of the wall of the ferromagnetic pipe to form a closed magnetic circuit and means for electrically connecting the coil of the electromagnetic to an input source of alternating current whereby a fluctuating magnetic field is induced generally axially through the wall of the pipe between the poles of the electromagnetic. The apparatus also comprises means adjacent the surface of the wall of the pipe between the poles of the electromagnet for sensing a leakage of the axial magnetic field therefrom and generating a signal corresponding to a sensed portion of the leakage. The apparatus further comprises means for electrically connecting the sensing means to a readable output device.

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