目标表面发射率对红外辐射偏振特性的影响分析

发布时间：2018-08-07 13:47

【摘要】：偏振探测不仅可以获得目标的光谱、强度、偏振态以及空间几何形状等参数,还可以获得更丰富的目标信息,有利于改善对目标的探测和识别能力。红外辐射偏振成像是近年来发展起来的一种新的红外探测技术,主要通过目标与场景的红外辐射偏振特性差异进行目标探测与识别。但由于红外辐射偏振信息在传输过程中,其偏振态会受到传输介质的影响,而通常基于实验分析总结目标红外偏振特性的方法难以对偏振传输过程中的影响因素进行估计,也不能定量描述各相关参数对于红外偏振信息的影响。通过微面元理论的双向反射分布函数模型,建立了基于偏振双向反射分布函数的红外辐射偏振传输方程,推导分析了目标表面发射率对红外辐射偏振度的影响,结果表明:目标表面发射率对目标红外偏振度影响可以忽略;在理论分析基础上,有针对性的开展红外光谱偏振探测试验,试验数据分析与理论推导结论吻合。这表明:材料表面发射率的变化不影响目标表面的红外辐射偏振度。该研究成果有利于提高红外伪装探测的目标识别效率,可为进一步提高红外偏振成像系统的伪装目标探测提供新的途径和方法,如在伪装目标探测识别中,通过探测其表面的红外辐射偏振特性的改变实现伪装目标识别探测。
[Abstract]:Polarization detection can not only obtain the parameters of target spectrum, intensity, polarization state and spatial geometry, but also obtain more abundant target information, which is helpful to improve the ability of target detection and recognition. Infrared radiation polarization imaging is a new infrared detection technology developed in recent years. However, the polarization state of the infrared radiation polarization information is affected by the transmission medium during the transmission process. However, it is difficult to estimate the influence factors of the infrared polarization information transmission process based on the experimental analysis and summary of the infrared polarization characteristics of the target. Nor can the influence of relevant parameters on infrared polarization information be quantitatively described. Based on the bidirectional reflectance distribution function model of microplane theory, the polarization transfer equation of infrared radiation based on polarization bidirectional reflectance distribution function is established, and the effect of target surface emissivity on the polarization degree of infrared radiation is deduced and analyzed. The results show that the influence of the target surface emissivity on the infrared polarization degree of the target can be neglected, and on the basis of the theoretical analysis, the infrared spectral polarization detection experiment is carried out, and the experimental data analysis is in agreement with the theoretical conclusion. The results show that the change of surface emissivity does not affect the degree of polarization of infrared radiation on the target surface. The research results are helpful to improve the target recognition efficiency of infrared camouflage detection, and provide a new way and method for further improving the camouflage target detection of infrared polarization imaging system, such as in camouflage target detection and recognition. The detection of camouflage targets is realized by detecting the polarization characteristics of infrared radiation on its surface.
【作者单位】：北京环境特性研究所光学辐射重点实验室;信阳师范学院物理电子工程学院;
【基金】：国家重点基础研究发展计划(973)项目(613225)资助
【分类号】：O436.3

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