Author(s): WANG Shu-juan, KANG Lei, LI Zhi-chao, ZHAI Guo-fu
Pages: 123-128
Year: 2009 Issue:  30
Journal: Proceedings of the CSEE
Keyword:  electromagnetic acoustic transducer; 3-D finite element analysis; optimum design; orthogonal test design; key parameter;
Abstract: The deficiency of designing theories of electromagnetic acoustic transducers (EMATs) severely confines the further expansion of their scope of application. To thoroughly solve this problem, this paper built a 3-D finite element model of an surface wave EMAT used for the surface inspection of aluminum plates. Simulation analysis of the model revealed that transduction efficiency of the EMAT was greatly affected by EMAT parameters. As a consequence, based on the established model and by utilizing orthogonal test method, this paper extracted EMAT’s key parameters that significantly influenced the transduction efficiency of the transducer; obtained the basic designing principle of the EMAT; and accomplished the optimum design of the EMAT by studying the coil and the magnet individually. Experiment indicated that after optimization the amplitude of the EMAT-received signal increased by 2.99 times. The transduction efficiency of EMATs can be effectively improved by utilizing orthogonal test method based on 3-D finite element model.