Single SH guided wave mode generation method for PPM EMATs

doi:10.1088/1674-1056/ab81f8

中国物理B ›› 2020, Vol. 29 ›› Issue (5): 54303-054303.doi: 10.1088/1674-1056/ab81f8

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Single SH guided wave mode generation method for PPM EMATs

Guo-Fu Zhai(翟国富), Yong-Qian Li(李永虔)

Institute of Reliability in Electrical Apparatus and Electronics, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2019-12-06 修回日期:2020-03-12 出版日期:2020-05-05 发布日期:2020-05-05
通讯作者: Yong-Qian Li E-mail:15B906029@hit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51977044).

Single SH guided wave mode generation method for PPM EMATs

Guo-Fu Zhai(翟国富), Yong-Qian Li(李永虔)

Institute of Reliability in Electrical Apparatus and Electronics, Harbin Institute of Technology, Harbin 150001, China

Received:2019-12-06 Revised:2020-03-12 Online:2020-05-05 Published:2020-05-05
Contact: Yong-Qian Li E-mail:15B906029@hit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51977044).

摘要/Abstract

摘要： Using periodic permanent magnet (PPM) electromagnetic acoustic transducers (EMATs), different shear horizontal (SH) guided wave modes can form simultaneously in some situations, which can interfere with the inspection. The main cause of this phenomenon (typically named multiple modes) is related to the frequency bandwidth of excitation signals and the transducer spatial bandwidth. Simply narrowing the frequency bandwidth cannot effectively limit the number of different SH modes. Previous researches showed that unnecessary SH wave modes can be eliminated by using dual EMATs. However, in practical applications, it is more convenient to change the excitation frequency than to use dual EMATs. In this paper, the stress boundary conditions of the PPM-EMAT are analyzed, the analytical expression of SH guided wave is established, and the magnitude of SH guided wave mode under continuous tone and tone-burst input is obtained. A method to generate a single SH mode by re-selecting an operating point is proposed. Furthermore, the influence of the frequency bandwidth of the tone-burst signal is analyzed. Finally, a single SH mode excitation is achieved with tone-burst input.

关键词: operating point, multiple modes, SH guided waves, electromagnetic acoustic transducer (EMAT)

Abstract: Using periodic permanent magnet (PPM) electromagnetic acoustic transducers (EMATs), different shear horizontal (SH) guided wave modes can form simultaneously in some situations, which can interfere with the inspection. The main cause of this phenomenon (typically named multiple modes) is related to the frequency bandwidth of excitation signals and the transducer spatial bandwidth. Simply narrowing the frequency bandwidth cannot effectively limit the number of different SH modes. Previous researches showed that unnecessary SH wave modes can be eliminated by using dual EMATs. However, in practical applications, it is more convenient to change the excitation frequency than to use dual EMATs. In this paper, the stress boundary conditions of the PPM-EMAT are analyzed, the analytical expression of SH guided wave is established, and the magnitude of SH guided wave mode under continuous tone and tone-burst input is obtained. A method to generate a single SH mode by re-selecting an operating point is proposed. Furthermore, the influence of the frequency bandwidth of the tone-burst signal is analyzed. Finally, a single SH mode excitation is achieved with tone-burst input.

Key words: operating point, multiple modes, SH guided waves, electromagnetic acoustic transducer (EMAT)

中图分类号: (Electromagnetic and electrodynamic transducers)

43.38.Dv

43.20.Ks (Standing waves, resonance, normal modes) 43.35.Cg (Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in solids; elastic constants)

翟国富, 李永虔. Single SH guided wave mode generation method for PPM EMATs[J]. 中国物理B, 2020, 29(5): 54303-054303.

Guo-Fu Zhai(翟国富), Yong-Qian Li(李永虔). Single SH guided wave mode generation method for PPM EMATs[J]. Chin. Phys. B, 2020, 29(5): 54303-054303.

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Single SH guided wave mode generation method for PPM EMATs

Single SH guided wave mode generation method for PPM EMATs

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