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selective generation of ultrasonic Lamb waves by electromagnetic acoustic transducers

Chinese Physics B 2016年第12期25卷 1-8页

作者：李明亮邓明晰高广健 Department of Physics Logistics Engineering University

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 Larnb 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.

关键词： ultrasonic Lamb waves selective generation electromagnetic acoustic transducer (EMAT),Lorentz surface stress

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generation of narrowband Lamb waves based on the Michelson interference technique

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Chinese Physics B 2018年第5期27卷 328-333页

作者： Tian-Ming Ye Yan-Feng Xu Wen-Xiang Hu Institute of Acoustics Tongji University Shanghai 200092 China

An optical method of generating narrowband Lamb waves is presented. It is carried out with a laser line array in a thermoelastic regime implemented by the Michelson interference technique, where the formed array element spacing can be flexibly and conveniently changed to achieve selective mode excitation. In order to simulate the displacement response generated by this array, its intensity distribution function is presented to build a theoretical analysis model and to derive the integral representation of the displacement response. The experimental device and measuring system are built to generate and detect the Lamb waves on a steel plate. Numerical calculation results of narrowband Lamb wave displacement signals based on the theoretical model show good agreement with experimental results.

关键词： narrowband Lamb wave selective generation laser array laser ultrasonics

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