Enhancement of ultrasonic signal using a new design of Rayleigh-wave electromagnetic acoustic transducer

Lei Kang; Chao Zhang; Steve Dixon; Hui Zhao; Samuel Hill; Menghan Liu

doi:10.1016/j.ndteint.2016.11.008

Enhancement of ultrasonic signal using a new design of Rayleigh-wave electromagnetic acoustic transducer

Lei Kang^*
, Chao Zhang
, Steve Dixon
, Hui Zhao
, Samuel Hill
, Menghan Liu

^*Corresponding author for this work

School of Electrical Engineering and Automation, Harbin Institute of Technology
University of Warwick

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

87 Scopus citations

Abstract

The main disadvantage of electromagnetic acoustic transducers (EMATs) is their inefficiency in generating ultrasound. A new design of Rayleigh-wave EMAT is proposed with improved ultrasonic generation efficiency on non-ferromagnetic materials. The new EMAT's magnet is narrower than the meander-line coil used in the transducer and the coil itself has an uneven distribution of conductors. The principle of the new design is informed by finite element simulations, which show that the EMAT generates Rayleigh waves more efficiently by taking advantage of both horizontal and vertical magnetic fields of the magnet simultaneously. Experimental measurements verify that the maximum amplitude of the ultrasonic signal generated by the new design of EMAT working under a pulse-echo configuration has been enhanced by 90%, when compared to conventional designs.

Original language	English
Pages (from-to)	36-43
Number of pages	8
Journal	NDT and E International
Volume	86
DOIs	https://doi.org/10.1016/j.ndteint.2016.11.008
State	Published - 1 Mar 2017
Externally published	Yes

Keywords

EMAT
Electromagnetic acoustic transducer
Finite element simulation
Meander-line coil
Rayleigh wave

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10.1016/j.ndteint.2016.11.008

Cite this

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title = "Enhancement of ultrasonic signal using a new design of Rayleigh-wave electromagnetic acoustic transducer",

abstract = "The main disadvantage of electromagnetic acoustic transducers (EMATs) is their inefficiency in generating ultrasound. A new design of Rayleigh-wave EMAT is proposed with improved ultrasonic generation efficiency on non-ferromagnetic materials. The new EMAT's magnet is narrower than the meander-line coil used in the transducer and the coil itself has an uneven distribution of conductors. The principle of the new design is informed by finite element simulations, which show that the EMAT generates Rayleigh waves more efficiently by taking advantage of both horizontal and vertical magnetic fields of the magnet simultaneously. Experimental measurements verify that the maximum amplitude of the ultrasonic signal generated by the new design of EMAT working under a pulse-echo configuration has been enhanced by 90\%, when compared to conventional designs.",

keywords = "EMAT, Electromagnetic acoustic transducer, Finite element simulation, Meander-line coil, Rayleigh wave",

author = "Lei Kang and Chao Zhang and Steve Dixon and Hui Zhao and Samuel Hill and Menghan Liu",

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year = "2017",

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doi = "10.1016/j.ndteint.2016.11.008",

language = "英语",

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issn = "0963-8695",

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TY - JOUR

T1 - Enhancement of ultrasonic signal using a new design of Rayleigh-wave electromagnetic acoustic transducer

AU - Kang, Lei

AU - Zhang, Chao

AU - Dixon, Steve

AU - Zhao, Hui

AU - Hill, Samuel

AU - Liu, Menghan

PY - 2017/3/1

Y1 - 2017/3/1

N2 - The main disadvantage of electromagnetic acoustic transducers (EMATs) is their inefficiency in generating ultrasound. A new design of Rayleigh-wave EMAT is proposed with improved ultrasonic generation efficiency on non-ferromagnetic materials. The new EMAT's magnet is narrower than the meander-line coil used in the transducer and the coil itself has an uneven distribution of conductors. The principle of the new design is informed by finite element simulations, which show that the EMAT generates Rayleigh waves more efficiently by taking advantage of both horizontal and vertical magnetic fields of the magnet simultaneously. Experimental measurements verify that the maximum amplitude of the ultrasonic signal generated by the new design of EMAT working under a pulse-echo configuration has been enhanced by 90%, when compared to conventional designs.

AB - The main disadvantage of electromagnetic acoustic transducers (EMATs) is their inefficiency in generating ultrasound. A new design of Rayleigh-wave EMAT is proposed with improved ultrasonic generation efficiency on non-ferromagnetic materials. The new EMAT's magnet is narrower than the meander-line coil used in the transducer and the coil itself has an uneven distribution of conductors. The principle of the new design is informed by finite element simulations, which show that the EMAT generates Rayleigh waves more efficiently by taking advantage of both horizontal and vertical magnetic fields of the magnet simultaneously. Experimental measurements verify that the maximum amplitude of the ultrasonic signal generated by the new design of EMAT working under a pulse-echo configuration has been enhanced by 90%, when compared to conventional designs.

KW - EMAT

KW - Electromagnetic acoustic transducer

KW - Finite element simulation

KW - Meander-line coil

KW - Rayleigh wave

UR - https://www.scopus.com/pages/publications/85000348788

U2 - 10.1016/j.ndteint.2016.11.008

DO - 10.1016/j.ndteint.2016.11.008

M3 - 文章

AN - SCOPUS:85000348788

SN - 0963-8695

VL - 86

SP - 36

EP - 43

JO - NDT and E International

JF - NDT and E International

ER -

Enhancement of ultrasonic signal using a new design of Rayleigh-wave electromagnetic acoustic transducer

Abstract

Keywords

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