A structural health monitoring method based on magneto-optic imaging technology

Abstract

A magneto-optic imaging system is presented in this paper to detect invisible and buried subsurface flaws in metallic structural, which can be used to monitor structural health. The resulting power of the MO imaging system is mainly given by the parameters of the MO thin films, the magnetic excitation device and image processing algorithms. In this paper, the choice of the MO thin films, the design of the magnetic excitation device and the development of the image processing approaches are introduced in detail. Experimental tests have been done and the method presented is evaluated by the experimental results.

Magneto-Optic Microscope Technology for Nondestructive Testing

“…The presence of rivets or defects diverts the eddy current from its uniform flow, and hence generates magnetic field perpendicular to the surface of the specimen, as shown in Fig. 6 [18][19][20][21].…”