A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression

Yuedong Xie; Jiyao Li; Pu Huang; Le Zhang; Wenbin Tian; Mingyang Lu; Xin Zhao; Zhilin Huo; Zenghua Liu; Shupei Wang; Ruochen Huang; Wuliang Yin; Anthony Peyton; Lijun Xu

doi:10.1016/j.ndteint.2021.102501

A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression

Yuedong Xie, Jiyao Li, Pu Huang, Le Zhang, Wenbin Tian^*, Mingyang Lu^*, Xin Zhao, Zhilin Huo, Zenghua Liu, Shupei Wang, Ruochen Huang, Wuliang Yin, Anthony Peyton, Lijun Xu

^*Corresponding author for this work

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

Abstract

A new design of Window Function modulated electromagnetic acoustic transducers (EMATs) to generate unidirectional Rayleigh waves is proposed. The novel EMATs, Rectangular-Window-Meander-Line-Coil EMATs (RWMLC-EMATs) and Kaiser-Window-Meander-Line-Coil EMATs (KWMLC-EMATs), contain two variable length meander line coils with a spacing of one quarter of Rayleigh waves’ wavelength; the excitation signals for these two coils have a phase difference of 90 ⁰. The structure of the variable wire length determines the level of the sidelobes suppression; the structure of two meander line coils combined with the excitation signals with a phase difference of 90 ⁰ determine that Rayleigh waves only propagate along one direction. RWMLC-EMATs and KWMLC-EMATs are analyzed via a wholly analytical method and are validated with experiments, which proves the feasibility of the proposed EMATs structure. In addition, the effect of the wire step and the longest wire length are investigated analytically and experimentally. Results indicate that, wire step mainly affects the suppressed level of sidelobes – a large wire step leads to a small suppressed level of sidelobes. This work can be used for Rayleigh waves EMATs design and optimization to improve their defect detection capability.

Original language	English
Article number	102501
Journal	NDT & E International
Volume	123
Early online date	21 Jul 2021
DOIs	https://doi.org/10.1016/j.ndteint.2021.102501
Publication status	Published - 1 Oct 2021

Keywords

Beam directivity
Electromagnetic acoustic transducers (EMATs)
Sidelobes suppression
Unidirectional Rayleigh waves
Window function modulation

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10.1016/j.ndteint.2021.102501

Cite this

Xie, Y., Li, J., Huang, P., Zhang, L., Tian, W., Lu, M., Zhao, X., Huo, Z., Liu, Z., Wang, S., Huang, R., Yin, W., Peyton, A., & Xu, L. (2021). A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression. NDT & E International, 123, Article 102501. https://doi.org/10.1016/j.ndteint.2021.102501

@article{b6fadb365d1041feae8f5e2e0b742a78,

title = "A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression",

abstract = "A new design of Window Function modulated electromagnetic acoustic transducers (EMATs) to generate unidirectional Rayleigh waves is proposed. The novel EMATs, Rectangular-Window-Meander-Line-Coil EMATs (RWMLC-EMATs) and Kaiser-Window-Meander-Line-Coil EMATs (KWMLC-EMATs), contain two variable length meander line coils with a spacing of one quarter of Rayleigh waves{\textquoteright} wavelength; the excitation signals for these two coils have a phase difference of 90 0. The structure of the variable wire length determines the level of the sidelobes suppression; the structure of two meander line coils combined with the excitation signals with a phase difference of 90 0 determine that Rayleigh waves only propagate along one direction. RWMLC-EMATs and KWMLC-EMATs are analyzed via a wholly analytical method and are validated with experiments, which proves the feasibility of the proposed EMATs structure. In addition, the effect of the wire step and the longest wire length are investigated analytically and experimentally. Results indicate that, wire step mainly affects the suppressed level of sidelobes – a large wire step leads to a small suppressed level of sidelobes. This work can be used for Rayleigh waves EMATs design and optimization to improve their defect detection capability. ",

keywords = "Beam directivity, Electromagnetic acoustic transducers (EMATs), Sidelobes suppression, Unidirectional Rayleigh waves, Window function modulation",

author = "Yuedong Xie and Jiyao Li and Pu Huang and Le Zhang and Wenbin Tian and Mingyang Lu and Xin Zhao and Zhilin Huo and Zenghua Liu and Shupei Wang and Ruochen Huang and Wuliang Yin and Anthony Peyton and Lijun Xu",

note = "Funding Information: This work was supported in part by the National Natural Science Foundation of China under Grant 61901022 and the Fundamental Research Funds for the Central Universities KG12-1124-01 . Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = oct,

day = "1",

doi = "10.1016/j.ndteint.2021.102501",

language = "English",

volume = "123",

journal = "NDT & E International",

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publisher = "Elsevier BV",

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TY - JOUR

T1 - A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression

AU - Xie, Yuedong

AU - Li, Jiyao

AU - Huang, Pu

AU - Zhang, Le

AU - Tian, Wenbin

AU - Lu, Mingyang

AU - Zhao, Xin

AU - Huo, Zhilin

AU - Liu, Zenghua

AU - Wang, Shupei

AU - Huang, Ruochen

AU - Yin, Wuliang

AU - Peyton, Anthony

AU - Xu, Lijun

N1 - Funding Information: This work was supported in part by the National Natural Science Foundation of China under Grant 61901022 and the Fundamental Research Funds for the Central Universities KG12-1124-01 . Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/10/1

Y1 - 2021/10/1

N2 - A new design of Window Function modulated electromagnetic acoustic transducers (EMATs) to generate unidirectional Rayleigh waves is proposed. The novel EMATs, Rectangular-Window-Meander-Line-Coil EMATs (RWMLC-EMATs) and Kaiser-Window-Meander-Line-Coil EMATs (KWMLC-EMATs), contain two variable length meander line coils with a spacing of one quarter of Rayleigh waves’ wavelength; the excitation signals for these two coils have a phase difference of 90 0. The structure of the variable wire length determines the level of the sidelobes suppression; the structure of two meander line coils combined with the excitation signals with a phase difference of 90 0 determine that Rayleigh waves only propagate along one direction. RWMLC-EMATs and KWMLC-EMATs are analyzed via a wholly analytical method and are validated with experiments, which proves the feasibility of the proposed EMATs structure. In addition, the effect of the wire step and the longest wire length are investigated analytically and experimentally. Results indicate that, wire step mainly affects the suppressed level of sidelobes – a large wire step leads to a small suppressed level of sidelobes. This work can be used for Rayleigh waves EMATs design and optimization to improve their defect detection capability.

AB - A new design of Window Function modulated electromagnetic acoustic transducers (EMATs) to generate unidirectional Rayleigh waves is proposed. The novel EMATs, Rectangular-Window-Meander-Line-Coil EMATs (RWMLC-EMATs) and Kaiser-Window-Meander-Line-Coil EMATs (KWMLC-EMATs), contain two variable length meander line coils with a spacing of one quarter of Rayleigh waves’ wavelength; the excitation signals for these two coils have a phase difference of 90 0. The structure of the variable wire length determines the level of the sidelobes suppression; the structure of two meander line coils combined with the excitation signals with a phase difference of 90 0 determine that Rayleigh waves only propagate along one direction. RWMLC-EMATs and KWMLC-EMATs are analyzed via a wholly analytical method and are validated with experiments, which proves the feasibility of the proposed EMATs structure. In addition, the effect of the wire step and the longest wire length are investigated analytically and experimentally. Results indicate that, wire step mainly affects the suppressed level of sidelobes – a large wire step leads to a small suppressed level of sidelobes. This work can be used for Rayleigh waves EMATs design and optimization to improve their defect detection capability.

KW - Beam directivity

KW - Electromagnetic acoustic transducers (EMATs)

KW - Sidelobes suppression

KW - Unidirectional Rayleigh waves

KW - Window function modulation

UR - http://www.scopus.com/inward/record.url?scp=85111751879&partnerID=8YFLogxK

U2 - 10.1016/j.ndteint.2021.102501

DO - 10.1016/j.ndteint.2021.102501

M3 - Letter

SN - 0963-8695

VL - 123

JO - NDT & E International

JF - NDT & E International

M1 - 102501

ER -

A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression

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Keywords

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A Novel Design of Window Function Modulated Meander-line-coils EMATs for Unidirectional Rayleigh Waves Generation and Sidelobes Suppression

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Keywords

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