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首页> 外文会议>Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II >Improved Mie Theory Scatter Model for Particulate Contamination that Conserves Energy and Obeys Reciprocity
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Improved Mie Theory Scatter Model for Particulate Contamination that Conserves Energy and Obeys Reciprocity

机译：节约能源并遵守互惠原则的改进的Mie理论散射模型用于颗粒污染

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摘要

Particulate contamination scatter is often modeled using Bidirectional Scatter Distribution Functions (BSDFs) based upon Mie scattering by a distribution of spherical particles. Starting with the basic model described in P. R. Spyak and W. L. Wolfe, we improve upon it by adding multiplicative geometrical form factors. These factors prevent the Total Integrated Scatter (TIS) from exceeding unity and ensure that reciprocity is always obeyed. Preventing the TIS from exceeding unity is necessary for energy to be conserved in the raytrace, and obeying reciprocity is necessary to obtain consistent results between forward and backwards raytraces. As will be shown, this improved model fits measured data better than the previous model.
机译：通常使用基于球形粒子分布的Mie散射的双向散射分布函数（BSDF）对颗粒污染物的散射进行建模。从P.R. Spyak和W.L.Wolfe中描述的基本模型开始，我们通过添加乘法几何形状因数对其进行改进。这些因素可防止总积分散射（TIS）超过单位，并确保始终遵守互惠原则。要在光线轨迹中保存能量，必须防止TIS超过单位，而为了获得前后光线轨迹之间的一致结果，必须服从互易性。如将显示的那样，此改进的模型比以前的模型更适合测量数据。

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