逆正向蒙特卡罗方法及应用

在打破传统蒙特卡罗方法在光线跟踪计算时各个子过程连贯性的基础上, 发展了灵活的逆正向蒙特卡罗法, 进而利用该方法研究了介质的矢量辐射传输问题。通过建立一维梯度折射率半透明介质模型, 模拟了大气层折射率 分布, 得到了考虑偏振时介质自身的 Stokes 矢量。研究结果表明, 梯度折射率介质不同表面的发射率存在一定的区别, 散射性介质在考虑偏振时表面发射率的结果与标量方法存在一定的差异。逆正向蒙特卡罗方法可用以解决矢量辐射 传输这类复杂问题。

Reverse forward Monte Carlo method and its application

On the basis of breaking the coherence of each subprocess in traditional Monte Carlo method in ray tracing, a flexible reverse forward Monte Carlo method is developed to study vector radiative transfer in media. The distribution of atmospheric refractive index is simulated by establishing a one-dimensional gradient refractive index translucent medium model, and the Stokes vector of the medium considering polarization is studied. The results show that the emissivity of different surfaces of graded-index medium is different, and the emissivity of scattering medium when polarization is considered is different from that of scalar method. It is shown that the reverse forward Monte Carlo method can be used to solve the complex problems such as vector radiative transfer.