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Proceedings of the International Symposium on Microsystems, Intelligent Materials and Robots, (1995) Sendai, Japan, pp.634-637

Application of a New High Sensitivity Magnetic Field Sensor for Nondestructive Testing

G. Vértesy(a), Cs.S. Daróczi(a), J. Szöllősy(a), J. Pávó(b), K. Miya(c)

(a) Hung. Acad. Sci., Research Institute for Materials Science ATKI, H-1525 Budapest, P.O. Box 49, Hungary
(b) Technical University of Budapest, Department of Electromagnetic Theory, H-1521 Budapest, Hungary
(c) Nuclear Engineering Research Laboratory, The University of Tokyo, Tokai, Ibaraki, 319-11, Japan

A high sensitivity magnetic field sensor which has recently been developed is applied for non-destructive testing. The sensor can be effectively utilized for the detection of defects in conducting materials using Eddy Current Testing measurements. The principle of our measuring technique is based on the combination of the detection of changes in the eddy current magnetic field and the variation of magnetic polarization of the sample due to the presence of the defect. Measurements were performed using this technique on non-ferromagnetic stainless steel samples. 10 % deep cracks on one side of the specimen can be identified from the reverse side (OD 10 % crack). Cracks having different dimensions result different image contrast after data acquisition which makes possible to reconstruct the size and the position of the crack by evaluating a series images taken at different frequencies.

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