Oblique Point-Focusing Shear-Horizontal Guided-Wave Electromagnetic Acoustic Transducer With Variable PPM Spacing

被引：6

作者：

Sun, Hongyu ^{[1
]}

Wang, Shen ^{[1
]}

Huang, Songling ^{[1
]}

Peng, Lisha ^{[1
]}

Wang, Qing ^{[2
]}

Zhao, Wei ^{[1
]}

机构：

[1] Tsinghua Univ, State Key Lab Power Syst, Dept Elect Engn, Beijing 100084, Peoples R China

[2] Univ Durham, Dept Engn, Durham DH1 3LE, England

来源：

IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL | 2020年 / 67卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Focusing; Acoustics; Transducers; Coils; Permanent magnets; Energy conversion; Frequency control; Electromagnetic acoustic transducer (EMAT); oblique point-focusing; shear-horizontal (SH) guided-wave; variable periodic permanent magnet (PPM) spacing; EMAT; SIGNALS; RECOGNITION; EXTRACTION; DESIGN; PLATE;

D O I：

10.1109/TUFFC.2020.2980621

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

We realized a phase-coherent oblique point-focusing shear-horizontal (SH) guided-wave electro- magnetic acoustic transducer (EMAT) composed of variable-spacing periodic permanent magnets (PPMs) and racetrack coils. For traditional focusing transducers, the necessary focal position adjustment in defect detection requires a redesign of the coil structure. More conveniently, this new transducer structure arrangement can achieve wave focusing and focal position change by rationally adjusting the layout of the PPM without changing the coil structure. Simulation results show that this newly designed transducer has good focusing performance: it can successfully focus the signal to a preset point, and the signal amplitude is nearly double that of the nonfocusing side. In addition, the focusing performance optimization of the transducer has been studied. The experimental results agree well with the actual location and size of a defect, which verifies the effectiveness of the newly designed focusing transducer in defect detection.

引用

页码：1691 / 1700

页数：10

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