Barkhausen effect is a noise generated in ferromagnetic materials during the course of magnetization under the application of magnetic fields. Examination is made for counting the event rate of the Barkhausen noise in a steel plate under a quasi-static magnetization process. It is found that the event rate depends on the course of the magnetization or the route and direction in the B-H hysteresis loop and the rate increases in the presence of flaws or cracks. Utilizing this phenomenon, a new technique is proposed for detecting flaws in ferromagnetic materials. The technique provides a method for detecting cracks from the rear surface of the plate.
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