Affiliations: [a] c/o Y. Saito Lab., Hosei University, Kajino Koganei, Tokyo, Japan | [b] Department of Electrical Apparatus, Technical University of Sofia, Sofia, Bulgaria
Correspondence:
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Corresponding author: Mirai Iida, c/o Y. Saito Lab, Hosei University 3-7-2 Kajino Koganei, Tokyo 184-8584, Japan. E-mail:m.iida@al.t.u-tokyo.ac.jp
Abstract: Ferromagnetic materials are widely used for various
artificial products such as cars, trains, ships and so on. Because of its
mechanical property, iron steel is most popular in use for the frame
materials. Nondestructive testing of iron steel is an extremely important
way to maintain their mechanical reliability. It is well known fact that the
Barkhausen signals are emitted from only the ferromagnetic materials having
magnetic domain structures. Also this signal varies depending upon their
past mechanical as well as radioactive stress histories. In the present paper, we have applied a generalized frequency fluctuation
analysis to the Barkhausen signals to detect the various mechanical
stresses. Surprisingly, it has been succeeded in clarifying that application
of our frequency fluctuation analysis to the Barkhausen signals makes it
possible to detect the several kinds of mechanical stress.
Keywords: Barkhausen signal, frequency fluctuation, signal processing, least squares
