基于一种随机粗糙表面构型的偏振双向反射分布函数  

pBRDF Based on New Configuration for Rough-Surface Materials

作　　者：郑爽 杨迪[2] 刘卿[2] 朱肇昆 ZHENG Shuang;YANG Di;LIU Qing;ZHU Zhaokun(Changchun China Optics Science and Technology Museum,Changchun,China;Beijing Institute of Tracking and Telecommunication Technology,Beijing,China)

机构地区：[1]长春中国光学科学技术馆,长春 [2]北京跟踪与通信技术研究所,北京

出　　处：《光电技术应用》2022年第6期22-27,98,共7页Electro-Optic Technology Application

基　　金：国家自然科学基金(61890965)。

摘　　要：针对PG模型预测粗糙表面材质偏振特性存在较大误差的问题,通过分析镜面微元组合的模型基础假设、建模过程、反演拟合结果,定位了PG模型误差存在的原因;提出了随机粗糙表面为半球形微元组合的新假设,基于表面精细结构下倏逝波存在的物理事实,忽略穿透深度和相位延迟的影响,建立了等效球形粒子组合的新构型;在此基础上,构建了新的表面反射模型,细化了材质内部的散射模型,形成了新的pBRDF模型;在实验室全谱光源照射下,获得了材质的多光谱偏振二向反射数据,进行了PG与新模型的性能对比分析。结果表明,新模型强度维和偏振维的误差约为PG模型的35%和59%。Focusing on the unneglectable error of testing results for the rough surface material by the PG model,the basic model assumption,modeling process,parameters inversion and fitting results are analyzed,and the cause for the error is found out.Taking the physical fact that evanescent wave existing in the fine structured surface as the basis,and ignoring the penetration depth and phase delay,a new assumed surface configuration which is integrated into micro-hemispheroid is created.Then,a new reflectance function is built,the inner scatter function is refined,and a new pBRDF is established.Illuminated by full spectrum light in a laboratory,the spectrum testing data of dual-directional reflectance for surface is acquired,and the performance of the PG model and the new model is compared.The result indicates that the new model error in the radiance and the DOLP is respectively about 35% and 59% of that of the PG model.

关 键 词：偏振双向反射分布函数 随机粗糙表面 倏逝波 参数反演 

分 类 号：TB342[一般工业技术—材料科学与工程] O436.3[机械工程—光学工程]