三波段大气传输红外偏振特性对比分析  

Atmospheric transmission simulation and analysis on the polarization system in three infrared wavebands

作　　者：陈振跃[1] 王霞[1] 张明阳[1] 金伟其[1] 

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081

出　　处：《红外与激光工程》2013年第9期2299-2304,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61231014)

摘　　要：偏振成像系统利用目标和背景偏振度上的差异,有效地提高了人造或伪装目标的探测识别效率。但红外目标的偏振传输是一个复杂的过程,受大气的影响较大,因此,有必要对不同目标的偏振特性和其影响因素以及大气作用的影响(包括大气吸收、辐射及悬浮粒子散射等)进行研究。进一步推导了红外偏振辐射控制方程;基于对目标和背景偏振特性的先验知识,利用大气传输计算软件MODTRAN对3个典型红外波段的大气吸收及程辐射进行计算;并对大气传输后的目标辐射偏振度对比度和强度对比度进行仿真。结果表明:在短波红外波段,目标的反射成分占主导地位;在中波红外波段,目标的自发辐射和反射均不可忽略;在长波红外波段,目标的辐射占主导地位,利用偏振成像效果优于强度成像。结果与理论分析基本一致。研究内容为红外波段目标的探测方式选择提供了参考依据。Compared with traditional infrared imaging, polarization imaging system can detect and identify the man-made or camouflaged target more effectively by using the differences of the degree of polarization between a target and its background. As the polarization transmission is a complex process, it＇s necessary to study polarization properties of different objects and atmospheric effects, including atmospheric absorption, atmospheric path radiation and scattering of suspended particles in the atmosphere. In this paper, a general expression of polarized radiation control equation was obtained firstly. Secondly, the atmospheric absorption coefficient and path radiation in NIR, MWIR and LWlR were modeled and calculated respectively by using MODTRAN software. The polarization contrast and intensity contrast between the target and background with increasing detection distance were calculated. The results show that in NIR waveband, the reflection intensity is in a dominant position and that in MWIR both intensity and radiation cannot be ignored. While in LWIR, the radiation is in a dominant position and therefore in general polarization imaging has more advantages consistent with the theoretical analysis. All the work of the way in IR detection. than intensity imaging. The results mentioned above provides a reference

关 键 词：红外偏振成像 偏振传输 大气作用 仿真实验 

分 类 号：TN219[电子电信—物理电子学] O439[机械工程—光学工程]