基于偏振蒙特卡罗法的散射环境前向传输优化算法  

Forward Transmission into Scattering Media by an Improved Polarized Monte Carlo Program

作　　者：曾祥伟 张燕 杨钧秀 Zeng Xiangwei;Zhang Yan;Yang Junxiu(College of Transportation,Ludong University,Yantai 264025,Shandong,China;Shandong Deheng Human Resources Co.,Ltd.,Yantai 264025,Shandong,China)

机构地区：[1]鲁东大学交通学院,山东烟台264025 [2]山东德衡人力资源股份有限公司,山东烟台264025

出　　处：《光学学报》2023年第18期371-377,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62105136)。

摘　　要：偏振蒙特卡罗法在模拟大量光子传输时不存在由有限离散引起的计算误差,因而通常作为验证其他方法计算精度的标准。通常情况下,偏振保持特性良好的光子的信息损耗少且传输距离远,分析这些光子的传输特性对于提取优良信号具有潜在的应用价值。为此,基于偏振子午面蒙特卡罗法,提出一种散射环境中前向传输光子偏振态的统计方法。模拟计算偏振光在聚苯乙烯悬浊液中的传输特性,结果表明,优化算法不仅能够反映光子偏振态的变化情况,而且能够统计偏振保持特性良好的光子数占比。Objective Vector radiation transport in scattering media is a research hotspot.The exact analytical solution to the vector radiative transfer equation cannot be obtained without the simplified treatment,and it needs to be calculated by numerical calculation methods.The polarized Monte Carlo program simulates the transmission of mass photons.As it does not lead to computational errors due to finite dispersion,the program is usually employed as a standard to verify the computational accuracy of other methods.At present,this method can obtain the outgoing polarization state of each light wave after the solution is obtained,but it is difficult to know the photon transmission situation.This limits the analysis of the polarization state retention of scattering light.However,photons with good retention characteristics of the polarization state usually have a small information loss and a long transmission distance.The study and analysis of these photons can be potentially applied to extract good transmission signals.Methods This paper proposes a method to count the photon polarization states during forward transmission into scattering media on the basis of the polarization meridian Monte Carlo program.The original algorithm and improved algorithm are shown in Fig.1.The white part is required for calculating both the original algorithm and the improved algorithm,and the blue part is the additional flow for calculating the improved algorithm.One hundred thousand parallelly polarized photons or right-handed circularly polarized photons are sent into a slab represented by one particular particle distribution for each environment,and photons are transmitted at a given distance.Then,the aggregated polarization is calculated from the photons that arrive in a given area,and photons on the front face of the slab are considered the transmitted photons.This process continues for all the launched photons,and the result is calculated.For the original algorithm,a photon completes forward transmission when it passes through a specific

关 键 词：散射 偏振 多重散射 传输 计算光学 

分 类 号：O436[机械工程—光学工程]