中文摘要：

分别从理论和实验上研究了脉冲激光在快、慢镀层圆柱表面激发的表面波声场。脉冲激光线源在镀层圆柱周向上激发超声波信号并利用激光干涉仪检测。对钢基底锌镀层圆柱和锡基底铜镀层圆柱试样表面波的理论频散和实验信号估计频散进行了比较,瞬态位移场则利用留数定理与FFT技术数值仿真得到并与实验波形进行对比。结果显示：理论频散和仿真波形与实验信号都具有极好的一致性,而快、慢镀层圆柱之间的表面波性质有显著差异。文中所用理论分析和数值方法为使用激光超声技术反演和定量表征镀层材料参数等无损检测技术奠定了理论基础。

英文摘要：

The surface wave fields on fast and slow coated cylinder have been investigated both in theory and experiment. The cylindrical surface waves are generated by a pulsed laser line source and detected by a laser interferometer. Dispersive relations estimated with experiment signals on both slow coated cylinder（zinc/steel）and fast coated cylinder （copper/tin）are compared with that calculated in theory.Further more,transient normal displacement fields of the surface waves are calculated by using residue theory and FFT technique.The results show that both theoretical surface wave signals and dispersive curves agree well with experimental results,but the two kinds of circumferential surface waves are dramatically different in dispersive properties and transient signals.Theoretical analysis and numerical computational method used in this paper provide a way to quantitatively characterize and invert the coating parameters of coated cylinder by using laser generated surface waves.