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

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

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
Early online date	29 Nov 2016
DOIs	https://doi.org/10.1016/j.ndteint.2016.11.008
Publication status	Published - 1 Mar 2017

Keywords

Electromagnetic acoustic transducer
EMAT
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 = "Electromagnetic acoustic transducer, EMAT, 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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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.

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KW - Rayleigh wave

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

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Keywords

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