Bilinear Time-frequency Analysis for Lamb Wave Signal Detected by Electromagnetic Acoustic Transducer

摘要：

　　Accurate acquisition of the detection signal travel time plays a very important role in cross-hole tomography.The experimental platform of aluminum plate under the perpendicular magnetic field is established and the bilinear time-frequency analysis methods,Wigner-Ville Distribution(WVD)and the pseudo-Wigner-Ville distribution(PWVD),are applied to analyse the Lamb wave signals detected by electromagnetic acoustic transducer(EMAT).By extracting the same frequency component of the time-frequency spectrum as the excitation frequency,the travel time information can be obtained.In comparison with traditional linear time-frequency analysis method such as short-time Fourier transform(STFT),the bilinear time-frequency analysis method PWVD is more appropriate in extracting travel time and recognizing patterns of Lamb wave.

作者: Wenxiu Sun Guoqiang Liu Hui Xia Zhengwu Xia

作者单位: Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing,China;University of Chinese Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing,China

会议类型: 国际会议

会议名称: 2017 International Symposium on Application of Materials Science and Energy Materials (SAMSE 2017) (2017材料科学应用与能源材料国际研讨会)

会议地点: 上海

会议语种:英文

页码: 1-6

在线出版日期: 2017-12-28（万方平台首次上网日期，不代表论文的发表时间）