对金属表面热红外偏振特性的模型进行了研究,在建模中不仅考虑了金属表面的统计特性,也考虑了特别粗糙的金属表面存在的遮蔽效应问题。通过计算机模拟出不同表面粗糙度的金属板热红外偏振度和金属表面热红外辐射角之间的关系曲线,并和实验获得的结果进行了对比。对于表面粗糙度为1.6 μm的较为光滑的金属表面,模拟的结果基本吻合了实验中获得的数据。对于表面粗糙度为6.8 μm的较为粗糙的金属表面,仿真出的结果和实验中获得的数据相差较大。但在考虑了遮蔽效应后,模型模拟的结果得到了很大的改善。通过对模型的研究,分析确定了对金属板表面热红外偏振度影响的主要因素。

The model of thermal infrared polarization properties of the metal surface was discussed. The statistic properties were considered in this model as well the surface shadowing effect.The relation between thermal infrared polariztion and irradiation angle is simulated for different surface roughness. The simulation results of smooth metal surface with roughness of 1.6 μm accord with the experimental data very well, but the simulation results of rough metal surface with roughness of 6.8 μm disaccord with the experimental data. After the shadowing effect of the rough metal surface is considered, the simulation results is improued greathy. The main related factors to determine the thermal polarization properties of the metal surface were discussed.