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

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

doi:10.1109/TUFFC.2013.2864

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

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

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	2657-2664
Number of pages	8
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	60
Issue number	12
Early online date	21 Nov 2013
DOIs	https://doi.org/10.1109/TUFFC.2013.2864
Publication status	Published - 1 Dec 2013

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10.1109/TUFFC.2013.2864

Cite this

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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.",

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AU - Kang, Lei

AU - Zhai, Guofu

PY - 2013/12/1

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AB - 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.

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