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Chin. Phys. B, 2016, Vol. 25(12): 124301    DOI: 10.1088/1674-1056/25/12/124301
SPECIAL TOPIC—Acoustics Prev   Next  

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)
Department of Physics, Logistics Engineering University, Chongqing 401331, China
Abstract  

In this paper, we describe a modal expansion approach for the analysis of the selective generation of ultrasonic Lamb waves by electromagnetic acoustic transducers (EMATs). With the modal expansion approach for waveguide excitation, an analytical expression of the Lamb wave's mode expansion coefficient is deduced, which is related to the driving frequency and the geometrical parameters of the EMAT's meander coil, and lays a theoretical foundation for exactly analyzing the selective generation of Lamb waves with EMATs. The influences of the driving frequency on the mode expansion coefficient of ultrasonic Lamb waves are analyzed when the EMAT's geometrical parameters are given. The numerical simulations and experimental examinations show that the ultrasonic Lamb wave modes can be effectively regulated (strengthened or restrained) by choosing an appropriate driving frequency of EMAT, with the geometrical parameters given. This result provides a theoretical and experimental basis for selectively generating a single and pure Lamb wave mode with EMATs.

Keywords:  ultrasonic Lamb waves      selective generation      electromagnetic acoustic transducer (EMAT)      Lorentz surface stress  
Received:  14 March 2016      Revised:  27 June 2016      Accepted manuscript online: 
PACS:  43.20.-f (General linear acoustics)  
  43.35.-c (Ultrasonics, quantum acoustics, and physical effects of sound)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474361 and 11274388).

Corresponding Authors:  Ming-Xi Deng     E-mail:  dengmx65@yahoo.com

Cite this article: 

Ming-Liang Li(李明亮), Ming-Xi Deng(邓明晰), Guang-Jian Gao(高广健) Selective generation of ultrasonic Lamb waves by electromagnetic acoustic transducers 2016 Chin. Phys. B 25 124301

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