Numerical and experimental analysis of unidirectional meander-line coil electromagnetic acoustic transducers

Author

Shujuan Wang ; Riliang Su ; Xiaoyang Chen ; Lei Kang ; Guofu Zhai

Author_Institution

Sch. of Electr. Eng. & Autom., Harbin Inst. of Technol., Harbin, China

Volume

60

Issue

12

fYear

2013

fDate

Dec. 2013

Firstpage

2657

Lastpage

2664

Abstract

The elastic waves generated by traditional meander- line coil electromagnetic acoustic transducers (EMATs) propagate in two directions, overlapping the echo signals from defects with the same distances, and the defect echo signal is hard to distinguish from the edge-reflected signal when the EMATs are near the edge of a specimen. In this paper, a unidirectional EMAT with two meander-line coils is proposed. A finite element model is used to simulate the directivity of the Rayleigh and shear vertical waves generated by these EMATs. Six transducers are fabricated using the printed circuit technique. The unidirectional Rayleigh wave and shear vertical wave are tested, and the results agree well with the simulation.

Keywords

Rayleigh waves; acoustic transducers; echo; finite element analysis; Rayleigh waves; defect echo signal; edge reflected signal; elastic waves; finite element model; shear vertical waves; unidirectional meander line coil electromagnetic acoustic transducer; Coils; Electromagnetics; Finite element analysis; Lorentz covariance; Magnetic fields; Magnetic flux density; Mathematical model;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2013.2864

Filename

6666086