摘要
一束激光照射到自由下落的稳恒射流与水平硬质阻隔板接触点处,可在液柱表面观察到亮暗相间的光环。液柱表面毛细波和激光在接触点处的漫反射是光环出现的必要条件,二者缺一不可。本文通过理论推导得到了表面毛细波波长的隐性表达式并对该式进行了定量实验验证;通过多组实验探究了不同参量对光环形态的影响;最后运用数值仿真分析了光场分布和光环成因。
As the contact point of a vertically falling water jet and a horizontal board was illuminated by a laser beam,rings of light could be observed on the surface of the jet.It was discovered that both the capillary waves and the diffuse reflection at the contact point were indispensable for the appearance of light rings.In this paper,the implicit expression for the wavelength of capillary waves was obtained and verified by quantitative experiments.In addition,experiments were also carried out to explore how the configurations of light rings depended on relevant parameters.At last,optical field distribution was computed with simulation softwares and the formation process of these light rings was analyzed.
出处
《物理与工程》
2018年第1期123-130,共8页
Physics and Engineering
关键词
光环
毛细波
垂直水流
漫反射
光场分布
light rings
capillary wave
vertical water jet
diffuse reflection
optical field distribution
