Testing arrangement for ferromagnetic bodies including magnetic

Details Testing arrangement for ferromagnetic bodies including magnetic Testing arrangement for ferromagnetic bodies including magnetic

1982-08-16

1985-08-27

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324235, G01N 2782, G01R 3306

Patent

active

045381089

ABSTRACT:
An apparatus for non-destructively testing ferromagnetic bodies to determine structural irregularities by means of magnetization of the respective object, comprises detectors for magnetic fields arranged close to the surface of the body, by which detectors any changes of behaviour of the magnetic field caused by structural irregularities can be determined. At least two stationary magnetic fields are arranged one after the other on the body that can be displaced in its longitudinal direction, the center axes of these magnetic fields being inclined toward each other at an angle. This angle is determined by the number of magnetic fields and is equal to the quotient from one hundred and eighty degrees and the number of magnetic fields. In the space between the poles of the magnetic field generators, the magnetic field detectors are stationarily arranged and in rows, each extending over a zone being equal to a body section to be tested, vertically to the shifting direction of the body. The outputs of the magnetic field detectors are connected time-multiplex to an evaluation circuit.

REFERENCES:
patent: 2770773 (1956-11-01), Cooley
patent: 3710236 (1973-01-01), Halsey et al.
patent: 3906357 (1975-09-01), Runshang
patent: 4087749 (1978-05-01), McCormack
patent: 4439730 (1984-03-01), Kauffman

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