A type of focused single-mode A0 Lamb wave EMAT for performance improvement

被引：0
作者：
Peng, Shunli [1 ,2 ]
Fan, Zubang [1 ,2 ]
Wu, Yunxin [1 ,2 ,3 ]
Zhang, Tao [1 ,2 ]
Yang, Xufei [1 ,2 ]
机构：
[1] Cent South Univ, Light Alloy Res Inst, Changsha 410083, Peoples R China
[2] Cent South Univ, State Key Lab Precis Mfg Extreme Serv Performance, Changsha 410083, Peoples R China
[3] Cent South Univ, Sch Mech & Elect Engn, Changsha 410083, Peoples R China
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2025年 / 64卷 / 03期
基金：
中国国家自然科学基金;
关键词：
electromagnetic acoustic transducer; point-focusing; A(0) mode Lamb wave; transduction efficiency; single-mode; DESIGN; MAGNET; AMPLITUDE;
D O I：
10.35848/1347-4065/adb821
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
In this paper, a Halbach array periodic permanent magnet (HPPM) electromagnetic acoustic transducer (EMAT) was proposed for generating a stronger and purer A(0) mode Lamb wave (A(0) wave). Compared to conventional periodic permanent magnets (PPM), the HPPM generates a more intense and purer horizontal magnetic field, enhancing A(0) wave amplitude by 28% and suppressing the S-0 mode Lamb wave (S-0 wave) by 32%. Additionally, a focused A(0) wave EMAT (FHPPM-EMAT) with arc structure is proposed. The FHPPM-EMAT demonstrates excellent transduction efficiency and focusing capability. An orthogonal analysis was conducted to evaluate the factors affecting the transduction efficiency of the FHPPM-EMAT. With optimized parameters based on orthogonal analysis, the FHPPM-EMAT achieved a 93% increase in A(0) wave amplitude compared to the HPPM-EMAT. Furthermore, the size of the focal area is characterized by a horizontal focal width (H-d) and a vertical focal width (V-d) of only 36.21 mm and 10.45 mm, respectively.
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页数：9
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