Single SH guided wave mode generation method for PPM EMATs

doi:10.1088/1674-1056/ab81f8

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.

Keywords: operating point multiple modes SH guided waves electromagnetic acoustic transducer (EMAT)

Received: 06 December 2019
Revised: 12 March 2020
Accepted manuscript online:

PACS:	43.38.Dv	(Electromagnetic and electrodynamic transducers)
	43.20.Ks	(Standing waves, resonance, normal modes)
	43.35.Cg	(Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in solids; elastic constants)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51977044).

Corresponding Authors: Yong-Qian Li
E-mail: 15B906029@hit.edu.cn

Cite this article:

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

[1]	Rose J L 1999 Ultrasonic waves in solid media (Cambridge: Cambridge University Press)
[2]	Ratassepp M, Lowe J S, Cawley P and Klauson A 2008 J. Acoust. Soc. Am. 124 2873
[3]	Liang C, Kogia M, Mohimi A, Kappatos V, Selcuk C and Gan T H 2017 Renew. Energy 101 771
[4]	Ma Q Z, Jiao J P, Hu P, Zhong X, Wu B and He C F 2014 Chin. J. Mech. Eng. 27 428
[5]	Hirao M and Ogi H 1999 NDT E Int. 32 127
[6]	AndruschakN, Saletes I, Filleter T and Sinclair A 2015 NDT E Int. 75 72
[7]	Choi S, Cho H and Lissenden C J 2018 Nucl. Eng. Technol. 50 890
[8]	Lee J H and Kim D H 2014 Int. J. Precis. Eng. Manuf. 15 2051
[9]	Petcher P A and Dixon S 2015 NDT E Int. 74 58
[10]	Castaings M 2014 Ultrasonics 54 1760
[11]	Vasile C F and Thompson R B 1979 J. Appl. Phys. 50 2583
[12]	Ribichini R, Cegla F, Nagy P B and Cawley P 2011 IEEE Trans. Ultrason. Ferroelectr. Freq. Control 58 2571
[13]	Kwon Y, Kim H W and Kim Y Y 2015 Ultrasonics 62 237
[14]	Choi S, Cho H and Lissenden C J 2017 Sensors 17 5
[15]	Petcher P A and Dixon S 2017 Nondestruct. Test. Eval. 32 113
[16]	Dixon S, Petcher P A, Fan Y, Maisey D and Nickolds P 2013 J. Phys. D-Appl. Phys. 46 445502
[17]	Kubrusly A C, Freitas M A, Von Der Weid J P and Dixon S 2018 IEEE Trans. Ultrason. Ferroelectr. Freq. Control 65 1239
[18]	Qiu G Z, Song X C, Zhang X, Tu J and Chen T 2019 Sensors 19 3019
[19]	Li M L, Deng M X and Gao G J 2016 Chin. Phys. B 25 124301
[20]	Hirao M and Ogi H 2018 Electromagnetic Acoustic Transducers: Noncontacting Ultrasonic Measurements using EMATs, 2nd edn. (Japan: Springer) pp. 17-21
[21]	Sun W X, Liu G Q, Xia H and Xia Z W 2018 Chin. Phys. B 27 084301
[22]	Advani S, Van Velsor J and Rose J L 2011 6th IEEE Sensors Applications Symposium, SAS, February 22-24, 2011, San Antonio, USA pp. 277-282

[1]	Lamb wave signal selective enhancement by an improved design of meander-coil electromagnetic acoustic transducer Wen-Xiu Sun(孙文秀), Guo-Qiang Liu(刘国强), Hui Xia(夏慧), Zheng-Wu Xia(夏正武). Chin. Phys. B, 2018, 27(8): 084301.
[2]	Selective generation of ultrasonic Lamb waves by electromagnetic acoustic transducers Ming-Liang Li(李明亮), Ming-Xi Deng(邓明晰), Guang-Jian Gao(高广健). Chin. Phys. B, 2016, 25(12): 124301.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Metrics
Related Articles

Single SH guided wave mode generation method for PPM EMATs

Cite this article:

Online attention