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作者机构:1Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870-0152 Japan 2Faculty of Engineering Oita University 700 Dannoharu Oita 870-1192 Japan
出 版 物:《AIP Conference Proceedings》
年 卷 期:2001年第557卷第1期
页 面:1724-1731页
摘 要:In order to detect small reverse-side cracks existing on 5 mm thick steel plates, we have measured strength of residual magnetization at 1 mm above 5 mm thick steel plates. A differential type magneto-impedance effect sensor (a gradio-MI sensor) is applied to measure it. Because the gradio-MI sensor is suitable for detection of localized micro magnetic field. From results of our experiments, a distribution of the residual differential magnetic field at 1 mm above a specimen is clearly changed near a reverse-side crack of 1 mm depth with 5 mm length. In this paper, experimental results utilizing the distribution of a residual differential magnetic field measured by gradio-MI sensors is shown. And, validity of the residual magnetic field method for inspection of small reverse-side cracks on thick steel plates is discussed.