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Title
Verfahren und Vorrichtung zur zerstoerungsfreien Ermittlung von Materialparametern von ferromagnetischen Werkstoffen
Date Issued
2004
Author(s)
Meyendorf, N.
Roesner, H.
Patent No
1996-19631311
Abstract
The method of testing ferromagnetic materials is simplified by application of electrodes at the edges of a cylindrically symmetrical test piece and passing an alternating current through the material. The resulting AC magnetic field gives rise to the Barkhausen effect which can be detected by means of a coil or magnetic sensor, without the need for Hall probes to measure the magnetic field. The method can be used for inducing surface waves in thin magnetic layers, where the use of Hall probes is particularly difficult. It is also useful for surface crack detection. ADVANTAGE - Simplified method of magnetisation of material without use of magnets or Hall probes.
Language
de
Patenprio
DE 1996-19631311 A: 19960802