Phase difference and interference between reflected cylindrical wave and head wave at a liquid/solid interface  

作　　者：FU Deyong LIU Liang CHEN Yifang ZHU Guozhen 

机构地区：[1]Department of Physics,Tsinghua University,Beijing 100084,China [2]Department of Mechanical Engineering,Tsinghua University,Beijing100084,China

出　　处：《Chinese Science Bulletin》2001年第18期1556-1560,共5页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 19604008 and 10074039).

摘　　要：The reflected field of pulsed cylindrical waves from a liquid-solid interface is studied by the numerical method and the experimental method. The reflected field is calculated and shown in gray pictures. The calculated incident angles θn (n=1, 2, 3, ...) of a series of minimums (or nulls) on the reflected wavefront are presented. The measured angle of the minimum from Schlieren photograph is consistent with that by calculation. The appearance of minimums is explained by the interference between the reflected wave and the head wave, and by the radiated dissipation of the head wave. The leading phase angle of the head wave to the reflected wave is proved to be about 3π/4 by the numerical calculation.The reflected field of pulsed cylindrical waves from a liquid-solid interface is studied by the numerical method and the experimental method. The reflected field is calculated and shown in gray pictures. The calculated incident angles θ n (n=1, 2, 3,…) of a series of minimums (or nulls) on the reflected wavefront are presented. The measured angle of the minimum from Schlieren photograph is consistent with that by calculation. The appearance of minimums is explained by the interference between the reflected wave and the head wave, and by the radiated dissipation of the head wave. The leading phase angle of the head wave to the reflected wave is proved to be about 3π/4 by the numerical calculation.

关 键 词：liquid-solid interface TRANSIENT field of CYLINDRICAL WAVES head WAVE and reflected WAVE phase DIFFERENCE and interference. 

分 类 号：O422[理学—声学]