Abstract
Ferromagnetic materials, i.e., iron steel and its composites, are widely used as the frame parts of various artificial products and constructions such as a building, bridge and so on. Because of its mechanical property, iron steel is most popular in use for the frame materials to maintain their mechanical strength. On the other side, nondestructive testing of iron steel is an extremely important way in order to keep their mechanical safeness.One of the deterministic differences between the ferromagnetic and non-magnetic materials is that all of the ferromagnetic materials when applying external magnetic field attracts major magnetic field; and also magnetization process of ferromagnetic materials always accompanies with the Barkhausen effects. Barkhausen effect is a phenomenon, which happens by movement of magnetic domain.Magnetic domain structure evaluation of most magnetic material is performed in the uniform magnetic field distribution. In this paper, we propose a designing strategy of the optimal exciting coil as the first step of a nondestructive testing method employing Barkhausen phenomenon. Further, we propose one of the visualizing methodologies of the Barkhausen phenomenon as the second step.
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