Affiliations: [a] Hungarian Academy of Sciences, Centre for Energy Research, Institute of Technical Physics and Materials Science, H-1121 Budapest, Hungary | [b] Institute of Physics ASCR, Na Slovance 2, Prague 18221, Czech Republic | [c] Department of Broadband Infocommunications and Electromagnetic Theory, Budapest University of Technology and Economics, H-1111 Budapest, Hungary | [d] Institute of Fluid Science, Tohoku University, Sendai 980-8577, Japan
Correspondence:
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Corresponding author: G. Vértesy, Centre for Energy Research, Institute of Technical Physics and Materials Science, Konkoly Thege Miklós ut 29-33, H-1121 Budapest, Hungary. Tel.: +36 1 3922677; Fax: +36 1 3922226; E-mail: vertesy.gabor@energia.mta.hu.
Abstract: Detectability of an artificial slot, placed at the bottom of a steel plate was investigated by the method of Magnetic adaptive testing (MAT), when the measurement was performed through another steel plate. Influence of an air gap (or of a nonmagnetic spacer) located either between the magnetizing yoke and the top plate surface or between the two plates was explored. It was found that if the thickness of the nonmagnetic spacer was not larger than 0.15 mm, it had no influence on the detectability of the slot in the given geometry. This result shows an excellent applicability of MAT, and it is encouraging for possible future practical applications. The empirical data were compared with results of an electromagnetic simulation, and the outcome was interpreted and explained.
Keywords: Local wall thinning, magnetic NDT, magnetic adaptive testing, nonmagnetic spacer
