Laser generation of surface waves on cylinder and coated cylinder
Analytical models of acoustic field excited by a pulsed-laser line source on a cylinder and a coated cylinder are presented. Surface wave dispersive behaviors for a cylinder with a slow coating are analyzed and compared with that of a bare cylinder. Based on this analysis, the laser-generated transient response of the cylindrical Rayleigh wave on cylinder and the perturbed cylindrical Rayleigh wave on coated cylinder and the higher modes are calculated from the models using residue theory and FFT technique. The theoretical results from the superposed waveform of the cylindrical Rayleigh wave and higher modes for both cylinder and coated cylinder agree well with the waveforms obtained from experiment. The transient response of perturbed Raleigh wave on coated cylinder is quite different with cylindrical Rayleigh wave on cylinder because of the guide of surface coating. The results show that the model and numerical method provide a useful technique for quantitatively characterizing coating parameters of coated cylinder by the laser generated surface waves.
Wen-Xiang Hu Shi-Gong Zhang
Institute of Acoustics, Tongji University, Shanghai, 200092, P.R. China
国际会议
2nd China-Korea Ioint Workshop on Ultrasonic Nondestructive Evaluation(第二届中韩双边超声无损评估学术会议)
上海
英文
57-63
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）