Observation of wedge waves and their mode transformation by laser ultrasonic technique
Observation of wedge waves and their mode transformation by laser ultrasonic technique
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激光超声技术观察楔波及其模式转变
DOI：
10.3788/col20110902.022501
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发表时间：
2011-02
影响因子：
3.5
通讯作者：
王丽娟
中科院分区：
文献类型：
--
作者：
袁玲;贾静;沈中华;王丽娟
利用激光超声技术研究了楔中楔波的色散特性和模式变换。采用脉冲激光激发和光学偏转光束法进行记录。通过沿楔形尖端沿着扫描激发激光器来检测许多WW。利用二维傅里叶变换方法得到了不同波长的波的色散关系，并揭示了不同波长的波在楔形上的阶数。通过固定激励位置和检测位置之间的距离，以及通过沿楔尖的法线方向沿着扫描样品来确定模式转换。
Wedge waves (WWs) in wedges, including their dispersion characteristics and mode transformation, are investigated using the laser ultrasound technique. Pulsed laser excitation and optical deflection beam method for detection are used to record WWs. Numerous WWs are detected by scanning the excitation laser along the wedge tip. Dispersions of WWs are obtained by using the two-dimensional (2D) Fourier transformation method, and different WW orders are revealed on the wedges. Mode transformation is determined by fixing the distance between the excitation and detection position, as well as by scanning the samples along the normal direction of the wedge tip.