TY - GEN
T1 - Meander line coil EMAT based on spatial pulse compression for rayleigh waves
AU - Jiang, Chuan Liu
AU - Li, Zhan Peng
AU - Wang, Shu Juan
AU - Wang, Sheng Bin
AU - Yang, Ran
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/11/20
Y1 - 2020/11/20
N2 - Electromagnetic acoustic transducer (EMAT) has been applied to generate Rayleigh waves, for evaluating the surface and near-surface quality of a sample. The main disadvantages of EMAT are their low coupling efficiency and signal to noise ratio (SNR). Pulse compression technology is adopted to improve SNR, which designing a designed excitation waveform and corresponding a matched filter. This paper presents new methods, called linear wavelength modulation (LWM) and nonlinear wavelength modulation (NLWM), to design Rayleigh wave EMAT. Different from traditional structure, it used non-equidistant meander line coils, which based on spatial pulse compression. A finite element model is established to prove the new structure can excite wave packets with designed spatial wavelength distribution. The feasibility of spatial pulse compression and the effectiveness of the new method are proved by the simulation and experiments.
AB - Electromagnetic acoustic transducer (EMAT) has been applied to generate Rayleigh waves, for evaluating the surface and near-surface quality of a sample. The main disadvantages of EMAT are their low coupling efficiency and signal to noise ratio (SNR). Pulse compression technology is adopted to improve SNR, which designing a designed excitation waveform and corresponding a matched filter. This paper presents new methods, called linear wavelength modulation (LWM) and nonlinear wavelength modulation (NLWM), to design Rayleigh wave EMAT. Different from traditional structure, it used non-equidistant meander line coils, which based on spatial pulse compression. A finite element model is established to prove the new structure can excite wave packets with designed spatial wavelength distribution. The feasibility of spatial pulse compression and the effectiveness of the new method are proved by the simulation and experiments.
KW - Electromagnetic acoustic transducer
KW - Non-equidistant meander-line coils
KW - Rayleigh waves
KW - Spatial pulse compression
UR - https://www.scopus.com/pages/publications/85101153543
U2 - 10.1109/FENDT50467.2020.9337551
DO - 10.1109/FENDT50467.2020.9337551
M3 - 会议稿件
AN - SCOPUS:85101153543
T3 - Proceedings of 2020 IEEE Far East NDT New Technology and Application Forum, FENDT 2020
SP - 41
EP - 45
BT - Proceedings of 2020 IEEE Far East NDT New Technology and Application Forum, FENDT 2020
A2 - Xu, Chunguang
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology and Application, FENDT 2020
Y2 - 20 November 2020 through 22 November 2020
ER -