蒙特卡罗模拟光通过大气后的时间分布

采用蒙特卡罗方法模拟了光通过光学特性参数不同的大气后透射光时间分布.分析了大气的散射系数、吸收系数、不对称因子及折射率对透射光时间分布的影响.结果表明:透射光时间分布曲线存在两个峰,分别对应子弹光与漫射光.各光学参数界定了子弹光、蛇形光、漫射光的大小和时间范围,并从统计模拟的角度解释了折射率大的大气中难以成像的因为.

Simulation of transmitted light through atmosphere by Monte Carlo method

Different turbid media have different optical parameters such as absorption coefficient, scattering coefficient, anisotropic factor and refractive index. Monte Carlo method was used to simulate the influence of optical parameters on the transmitted photons for light transmitted through different atmospheres. The result shows that the temporal distribution of transmitted light has two peaks corresponding to ballistic photons and diffuse photons, respectively. Every optical parameter affects both the number and time range of ballistic photons, snake photons and diffuse photons. From the angle of statistical simulation, it is explained why atmosphere imaging is difficult when the refractive index of atmosphere is large.