Single SH guided wave mode generation method for PPM EMATs

作     者：Guo-Fu Zhai Yong-Qian Li 翟国富;李永虔

作者机构：Institute of Reliability in Electrical Apparatus and ElectronicsHarbin Institute of TechnologyHarbin 150001China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2020年第29卷第5期

页      面：326-332页

核心收录：

学科分类：07[理学] 08[工学] 070206[理学-声学] 0802[工学-机械工程] 0702[理学-物理学] 

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

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

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 *** main cause of this phenomenon(typically named multiple modes)is related to the frequency bandwidth of excitation signals and the transducer spatial *** narrowing the frequency bandwidth cannot effectively limit the number of different SH *** researches showed that unnecessary SH wave modes can be eliminated by using dual ***,in practical applications,it is more convenient to change the excitation frequency than to use dual *** 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 ***,the influence of the frequency bandwidth of the tone-burst signal is ***,a single SH mode excitation is achieved with tone-burst input.