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Journal of Sensors
Volume 2012 (2012), Article ID 851231, 6 pages
Research Article

Eddy Current Transducer Dedicated for Sigma Phase Evaluation in Duplex Stainless Steel

1Department of Electrical and Computer Engineering, Faculty of Electrical Engineering, West Pomeranian University of Technology, al. Piastow 17, 70-310 Szczecin, Poland
2Laboratory of Nondestructive Testing, Corrosion and Welding, Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro, 21941-596 Rio de Janeiro, RJ, Brazil

Received 3 December 2011; Accepted 6 February 2012

Academic Editor: B. P. C. Rao

Copyright © 2012 Grzegorz Psuj et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The paper describes a new transducer dedicated for evaluation of a duplex stainless steel (DSS). Different phases which exist in DSS have influence on mechanical as well as on electrical properties. Therefore, an eddy current transducer was utilized. In order to achieve high sensitivity, a differential type of the transducer was selected. The performance of the transducer was verified by utilizing the samples which had a different amount of sigma phase.