气泡散射影响下的水下光传输特性研究  

Research on underwater light transmission characteristics under influence of bubbles scattering

作　　者：项玉龙 陈伟[1] XIANG Yulong;CHEN Wei(College of Meteorology and Oceanography,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学气象海洋学院,湖南长沙410073

出　　处：《红外与激光工程》2024年第12期266-274,共9页Infrared and Laser Engineering

摘　　要：海水中存在着许多大小不同的气泡,对水下光传输系统的性能产生重要影响。提出了一种气泡散射影响下的光传输仿真模型,相比于传统蒙特卡洛模型,该模型引入了散射系数的随机变化,并根据气泡量改变光子运动的步长,同时对激光在气泡中的传输特性开展了实验研究。结果表明,模型得到的接收光强分布与实验吻合较好,随着气泡量的增大,接收光强概率密度峰值从大于平均光强的位置逐步向小于平均光强的位置过渡。此外,还分析了接收光强平均值左右两侧能量比值的变化情况,发现随着气泡量的增大,接收光强能量比值呈现先增大后减小的趋势。研究所得结果对于理解气泡散射影响下的水下光传输特性具有指导意义。Objective Laser underwater transmission has many advantages,such as high transmission rate,low time delay and high precision.When light is sent underwater,it is affected by the absorption and scattering of particles in the water,as well as different types of turbulence,which further limits the wide application of light transmission systems.There is a large vorticity region near the bubble,and the movement of the bubble will produce turbulence.The more bubbles there are,the greater the number of bonds of the corresponding fluid,so that the bubbles contained in the fluid are more likely to break into small-scale bubbles,thus increasing the instability of the fluid and generating turbulence.Due to the wake of ships,underwater vehicles,wave breaking and other factors will produce bubbles,which will have an important impact on the performance of underwater optical transmission system.On the basis of previous studies,the underwater wireless optical transmission system under the influence of bubble scattering is studied in this paper.Methods A simulation model of light transmission under the influence of bubble scattering is proposed in this paper.Compared with the traditional Monte Carlo model,the model introduces random variation of scattering coefficient and changes the random step size of photon motion according to the amount of bubble in water.Based on the idea of simulation research,the transmission characteristics of laser in the bubble are experimentally studied,and the energy ratio between the left and right sides of the average received light intensity is analyzed.Results and Discussions The results show that the received light intensity distribution obtained by the model is in good agreement with the experiment.With the change of the position of bubbles,the probability density distribution of the received light intensity hardly changes significantly,and the probability of receiving light intensity reaches the maximum at the position with greater than the average light intensity(I/I0>1)(Fig.4).With the increas

关 键 词：水下光传输 仿真模型 蒙特卡洛 气泡 

分 类 号：P733.3[天文地球—物理海洋学]