固体板中超声驻波场的高阶光弹条纹  

Higher order photo-elastic fringes of ultrasonic standing wave field in a solid plate

作　　者：安志武[1,2] 廉国选 王小民[1,2] AN Zhiwu;LIAN Guoxuan;WANG Xiaomin(State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190;University of Chinese Academy of Sciences Beijing 100049)

机构地区：[1]中国科学院声学研究所声场声信息重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《声学学报》2018年第4期673-676,共4页Acta Acustica

基　　金：国家自然科学基金项目(11427809)资助

摘　　要：利用动态光弹法观测了超声波在固体板内多次反射形成的驻波。通过相干叠加增大声波应力,使得动态光弹实验中偏振光的相位变化大于一个周期,从而观测到固体内超声波由行波转化为驻波的过程,并对高阶干涉条纹反映的驻波场特性进行了讨论。通过对声波应力进行定量测量,评估了固体板中超声驻波的激发效率。本文的工作为利用动态光弹法研究透明固体中的高强度声波提供了一种可行的方法。The standing wave which is formed by ultrasonic wave reflected back and forth in a solid plate was observed by dynamic photo-elastic technique. The ultrasonic stress is amplified by constructive interference, which results in the phase difference of polarized light in dynamic photo-elastic experiment greater than one cycle. The evolution process from traveling wave to standing wave was observed, and then the properties of standing waves reflected by higher order photo-elastic fringes were discussed. By measuring the ultrasonic stress quantitatively, the excitation efficiency of standing wave was evaluated. This work provides a feasible method to study high intensity ultrasound in transparent solids.

关 键 词：干涉条纹 超声波 驻波场 固体板 光弹法 高阶 多次反射 相干叠加 

分 类 号：O426.2[理学—声学]