伪装材料表面偏振散射的几何光学解

散射光的偏振特征可以作为遥感信息来识别目标,给伪装技术带来了新的威胁.文中采用偏振相机在光学与红外波段测试了染料型和涂料型伪装材料的偏振散射光谱,研究了不同探测波段下粗糙材料表面的偏振散射机理.研究结果表明:染料型伪装材料的偏振度很小,当光源以不同的入射角照射其表面时,偏振度基本保持不变;涂料型伪装材料的偏振度较大,且随着入射角的增大,其散射光的偏振度也逐渐升高;材料散射光的偏振度与表面粗糙度成反比,染料型伪装材料具有较大的表面粗糙度,在与入射光的作用过程中多次散射占优,因此,其偏振度很小.利用几何光学理论分析了材料表面的偏振散射机理,分析结果与实验结论相吻合.在一定条件下,伪装材料的偏振散射特征与背景不同,偏振信息在伪装目标识别方面具有重要的军事应用价值.

Geometrical optics solution for surface polarimetric scattering of camouflage materials

The polarimetric characteristics of scattering light can be used as identifiable information in remote sensing, but it brings new threaten to camouflage technique. The polarimetric scattering spectrum of dyed camouflage materials and painted camouflage materials were measured by a polarization camera in optical and infrared waveband, the mechanism of polarimetric scattering on the rough surface was studied in different wavebands. The results show that the polarization degree of dyed camouflage materials is low and holds the line under different illumination conditions;the polarization degree of painted camouflage materials is relatively high and is directly proportional to incident angle;the polarization degree of scattering light inversely proportional to the roughness of surface. Dyed camouflage materials have a biggish rough surface and multi-scattering is a dominant action when incident light reaches the surface of the camouflage materials. The polarization degree was very small. The geometrical optics theory for random rough surfaces was used to analyze the polarimetric scattering mechanism. The analysis results agree with the experimental results. The characteristics of polarimetric scattering from camouflage materials is quite different from that from backgrounds under certain conditions, the polarimetric information is valuable in military application of camouflage targets identification.