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.