利用蒙特卡罗法描述光在水中多前向散射

A Monte Carlo Description of Multipling the Forward scattering of Light in Sea

利用蒙特卡罗法模拟光在水中的传播特性。把计算机提供的均匀分布的伪随机数 ,变换成为与描述媒质散射、吸收特性的函数一致的分布。把光线散射发生后相对坐标系变换成光线散射前绝对坐标系。模拟的结果表明 :经过海水散射的光是喇叭状展开 ,且中间的光子密度大 ,向四周逐渐减小。

The key for Monte Carlo methods to simulate light propagation in seawater is to define the relation between random numbers and light propagation.First,the random numbers,which are pseudo random numbers from a uniform distribution and obtained from the computer,are transformed so that random numbers are distributed according to the functions which describe the scattering and absorption properties of the medium.The transformation describes the scattering and absorption properties of the medium.Second,the relative coordinate system after a scattering interaction is transformed into the absolute coordinate system before the light scattering.The conclusions can be obtained from the simulation whit Monte Carlo method:light scattered in the seawater looks like a horn,and photons are dense in the middle of the horn,whereas they dilute around gradually in the environment.