基于Mueller矩阵的目标偏振特性分析  

Analysis of Polarization Characteristics of Targets Based on Mueller Matrix

作　　者：杨志勇 张志伟 蔡伟 李顺 Yang Zhiyong;Zhang Zhiwei;Cai Wei;Li Shun(State Key Discipline Laboratory of Ordnance Launch Theory and Technology,Rocket Force University of Engineering,Xi′an 710025,Shaanxi,China)

机构地区：[1]火箭军工程大学兵器发射理论与技术国家重点学科实验室,陕西西安710025

出　　处：《光学学报》2023年第1期130-139,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61505254)。

摘　　要：目标Mueller矩阵反映了光波在传播过程中偏振态的变化,其包含与目标自身有关的起偏、退偏等偏振特性。为进一步研究目标Mueller矩阵特性,通过将光波传播过程转化为相关半正定二次型函数实现偏振态变化线性运算的方法,定义目标净退偏特性和可以综合评价目标起偏特性和退偏特性的偏振度PΔ,并证明了其在偏振探测目标识别和偏振特性分析中的有效性。最后利用实验测量了不同入射角、粗糙度铝板的Mueller矩阵,通过定义粗糙度对目标偏振特性的影响因子Q和目标偏振特性随入射角变化的稳定性S,分析了入射角和粗糙度对目标Mueller矩阵特性的影响。Objective Mueller matrix of targets can reflect the change in the polarization state of the light in the propagation process,and it contains the polarization characteristics of the target itself,such as polarizance and depolarization.In the analysis of the characteristics of the Mueller matrix,most studies analyze the polarizance and depolarization characteristics separately.But in the process of theoretical derivation,it turns out that the two characteristics are independent of each other.Therefore,it is necessary to define a new index that can comprehensively evaluate the two characteristics.Methods In view of the shortcomings of the existing Mueller matrix measurement systems,this paper,based on the working principle of a polarization analyzer,improves and builds a rotating Mueller matrix measurement system.Then,the linear operation of the change in the polarization state is realized by transforming the propagation process of the light into a correlation semi-positive definite quadratic function,and a novel index is proposed to comprehensively evaluate the polarizance and depolarization characteristics of the Mueller matrix.In addition,we use a polarizer to verify the derived index and test the effectiveness of its comprehensive representation of the polarizance and depolarization characteristics.According to Mueller matrices of different targets published in the literature,their ability to identify targets during target detection is verified.Finally,Mueller matrices of aluminum plates under different incident angles and roughness are measured.The effect of incident angles and roughness on the Mueller matrix is analyzed by defining the influencing factor Q of roughness on polarization characteristics and stability S of the polarization characteristics to incident angle.Results and Discussions From the analysis results,it can be concluded that leaves,sand,soil,and glass of natural objects have weak polarizance characteristics,strong depolarization characteristics,and strong retained depolarization characteristi

关 键 词：测量 MUELLER矩阵 偏振探测 偏振特性 粗糙度 入射角 

分 类 号：O436.3[机械工程—光学工程]