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Book: Studies in Applied Electromagnetics and Mechanics 14, Electromagnetic Nondestructive Evaluation (II), Editors: R. Albanese, G. Rubinacci, T. Takagi and S.S. Udpa, IOS Press, Amsterdam (1998), ISBN: 90-5199-375-7, pp.17-23

DEPTH SENSITIVE DUAL-FREQUENCY EDDY CURRENT NDT MEASURING TECHNIQUE

Cs.S. Daróczi(a), A. Gasparics(b)

(a) Hungarian Academy of Sciences, Research Institute for Materials Science (ATKI), H-1525 Budapest, P.O. Box 49, Hungary
(b) Technical University of Budapest, Dept. of Electromagnetic Theory (BME)-ATKI, H-1521 Budapest, Hungary

Dual-frequency eddy current non-destructive measuring technique was developed in order to reduce the unwanted surface-related component of the induced signal for the benefit of the signal related to the deeper regions of the material and obtain better image of the samples in-depth. The technique is also appropriate to reduce the so called lift-off and tilt-off noises of the detector.

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