基于偏振微面元理论的红外偏振特性研究

针对基于金属线栅偏振片的红外偏振成像系统组成,需要考虑目标、大气、天空、偏振片的反射和自身辐射的影响,进而有效分析进入成像系统的红外偏振辐射组成。文章通过偏振微面元理论的散射函数模型,推导红外偏振辐射传输方程的Stokes表达式,得出红外偏振信息(偏振度、偏振角)与目标表面粗糙度、折射率、反射和观测角度等参数的数学模型,通过合理简化偏振信息表达式,仿真得出某材料的偏振度曲线与文献中实测数据基本一致,为进一步提高红外偏振成像系统的探测性提供理论依据和技术支持。

Research of infrared polarization characteristics based on polarization micro-surface theory

Aiming at the elements of infrared polarization imaging system based on metal wire-grid polarizer, a lot of affecting factors such as target, atmosphere, sky, polarizer reflect and radiate itself should be take into accounted, which is favorable for analyzing the infrared polarization radiation constitutes entering into the imaging system. Based on the bidirectional reflectance distribution function model, the paper establishes transmission equation of infrared polarized radiation that includes reflection and emission, and we deduces the mathematical model with respect to a lot of factors of the degree and the angle of polarization. By simplifying the formula of degree of polarization reasonable, the simulated curves of degree of polarization are consistent with the measured date in references. The result of this paper can afford gist theory and techno-gsustain for improving the detection capability of infrared polarization imaging system.