Special problems of electromagnetic-acoustic transducer for material non-destructive testing

Issue title: Proceedings of the tenth International Symposium on Applied Electromagnetics and Mechanics ISEM-Tokyo

Article type: Research Article

Authors: Čápová, Klára^{a; *} | Čáp, Ivo^a | Faktorová, Dagmar^a

Affiliations: [a] University of Zilina, Faculty of Electrical Engineering, Velky diel, 010 26 Žilina, Slovakia

Correspondence: [*] Corresponding author: Klára Čápová, Tel.: +421 41 5132100; Fax: +421 41 5252241; E-mail: [email protected]

Abstract: The present paper deals with the utilization of the electromagnetic-acoustic transducer (EMAT) for the non-destructive testing of conducting materials. The principle of the EMAT consists in the interaction of the electrodynamic structure of materials with an external electromagnetic (EM) field under influence of a bias magnetic field. It offers the possibility to generate an acoustic mode of the penetrating EM wave with the slow velocity and the attenuation of the acoustic wave or on the other hand to detect the EM wave due to its radiation from the surface of a conducting sample. The main advantage of the EMAT is the contactless generation and detection of the acoustic wave, or the acoustic mode of EM wave in a wide range of frequencies and temperatures. The special properties of EMAT's driving and detecting devices are presented in the paper.

DOI: 10.3233/JAE-2002-432

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 73-77, 2002