水下光场的蒙特卡罗法求解  

Monte Carlo method for solving underwater light field

作　　者：何大华[1] 程朴[1] 李阳阳 HE Dahua;CHENG Pu;LI Yangyang(Wuhan National Laboratory for Optoelectronics,Huazhong Institute of Electro-Optics,Wuhan 430223,China)

机构地区：[1]华中光电技术研究所武汉光电国家研究中心,湖北武汉430223

出　　处：《应用光学》2023年第2期268-274,共7页Journal of Applied Optics

基　　金：海军装备科研资助项目(7301×××)。

摘　　要：水下光场分布对水下光电成像质量具有决定性的影响,通过水下光场分布可以得到水下图像的传输退化模型。在给定水体光学参数的前提下,建立光子水下传输概率模型,利用Monte Carlo法模拟光子在水下的运动,可以获得水下光子散射点体积密度分布,求解出水下光场;在水体体散射函数为球形对称的条件下,利用Monte Carlo法得到的水下光场分布与理论公式的计算结果具有很好的一致性,验证了该方法的有效性;最后给出了水下理想点光源形成的水下光场分布。基于此结论,可以将Monte Carlo法求解水下光场的应用范围推广至水体体散射函数为一般表达式的情形。Underwater light field distribution has a decisive impact on the underwater photoelectronic imaging quality, and the transmission degradation model of underwater images can be obtained through the underwater light field distribution. Giving the optical parameters of water body, the probability model of underwater photon transmission was established. By using the Monte Carlo method to simulate the underwater photon motion, the volume density distribution of the underwater photon scattering points could be obtained and the underwater light field could be solved. Under the condition that the water volume scattering function was spherical symmetry, the underwater light field distribution solved by Monte Carlo method was in good agreement with the results of the theoretical formula, which verified the effectiveness of this method. Finally,the distribution of underwater light field formed by underwater ideal point light source was given. Based on this conclusion, the application range of Monte Carlo method in solving underwater light field can be extended to the case when the water volume scattering function is a general expression.

关 键 词：水下光电成像 水下光场 标量照度 蒙特卡罗法 光子自由程 均匀分布 

分 类 号：TN29[电子电信—物理电子学] O242[理学—计算数学]