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辐射耦合效应对目标红外偏振特性的影响

宿德志 刘亮 吴世永 张纪磊 王坤 刘陵顺

宿德志, 刘亮, 吴世永, 张纪磊, 王坤, 刘陵顺. 辐射耦合效应对目标红外偏振特性的影响[J]. 中国光学(中英文). doi: 10.37188/CO.2022-0035
引用本文: 宿德志, 刘亮, 吴世永, 张纪磊, 王坤, 刘陵顺. 辐射耦合效应对目标红外偏振特性的影响[J]. 中国光学(中英文). doi: 10.37188/CO.2022-0035
SU De-zhi, LIU Liang, WU Shi-yong, ZHANG Ji-lei, WANG Kun, Ling-shun LIU. Influence of radiation coupling effect on polarization characteristics of targets[J]. Chinese Optics. doi: 10.37188/CO.2022-0035
Citation: SU De-zhi, LIU Liang, WU Shi-yong, ZHANG Ji-lei, WANG Kun, Ling-shun LIU. Influence of radiation coupling effect on polarization characteristics of targets[J]. Chinese Optics. doi: 10.37188/CO.2022-0035

辐射耦合效应对目标红外偏振特性的影响

doi: 10.37188/CO.2022-0035
基金项目: 国家自然科学基金青年基金(No. 61205206)
详细信息
    作者简介:

    宿德志(1986—),男,内蒙古扎赉特旗人,硕士,副教授,主要从事红外偏振成像、红外偏振特性等方面的研究。主要学习经历如下:2004.09—2008.07 国防科学技术大学应用物理学学士;2008.09—2010.12 国防科学技术大学信息光学硕士。E-mail:sudezhifun@163.com

    刘 亮(1981—),男,湖北黄石人,博士,讲师,主要 从事高能激光技术、光电对抗技术研究。主要学习经历如下:1999.09—2003.07 华中师范大学物理学学士;2003.09—2005.12 国防科学技术大学光学工程硕士;2006.02—2010.12 国防科学技术大学光学工程博士。E-mail:liul513@126.com

    吴世永(1981—),男,广东阳春人,硕士,副教授,主要从事力学方面的研究。E-mail:wusy81@163.com

    张纪磊(1982—),男,山东烟台人,学士,讲师,主要从事物理实验教学,虚拟现实技术,微弧氧化技术等方面的研究。E-mail:zhangjilei9804@163.com

    王 坤(1985—),男,山东泰安人,硕士,讲师,主要从事非线性光学晶体、偏振特性等方面的研究。E-mail:sindy5674580@sina.com

    刘陵顺(1969—),男,教授,博士,研究方向为电机与控制。E-mail:lingshunliu@sohu.com

  • 中图分类号: TP72

Influence of radiation coupling effect on polarization characteristics of targets

Funds: Supported by National Natural Science Funds of China (Grant No. 61205206)
More Information
  • 摘要: 红外偏振成像技术具有探测距离远,目标识别率高等多种优势,但在复杂环境下目标偏振特性易受背景辐射影响,使得红外偏振设备的探测能力大幅降低。本文基于偏振双向反射分布函数,综合考虑目标和背景间的辐射耦合效应,建立了目标偏振度计算模型。对比研究了有强辐射背板和无强辐射背板两种情况下目标偏振度的变化情况,并针对陆基和机载探测等小角度探测情况,仿真研究了目标和背板的温度、夹角等参数对目标偏振度的影响规律。研究结果表明:目标和背板温度相同时,辐射耦合效应会显著降低目标的偏振度,但不会改变目标偏振度随温度升高而增大的趋势。当目标和背板温度为30 °C、40 °C和50 °C时,目标偏振度的最大值分别为无强辐射背板时的63.7%、44.9%和42.2%。可见温度越高,目标和背板间的辐射耦合效应越强,目标偏振度降低的比例越大。此外,辐射耦合效应的强弱不仅与温度有关,还与目标和背板的夹角有关。随着夹角的增大,目标偏振度先增大后减小,且在夹角约为105°处取得极大值。因此,辐射耦合效应会一定程度上改变目标偏振度,从而影响红外偏振设备的探测能力。最后,通过搭建的长波红外偏振成像系统,对建立的目标偏振度计算模型进行了实验验证,实验结果与仿真分析结果基本一致。本文研究成果对提升陆基和机载红外偏振设备的探测和识别能力具有一定指导意义。

     

  • 图 1  红外辐射模型。$ {\theta _O} $$ {\theta _B} $分别为目标和背板的入射角, $ {\alpha _{O\_B}} $为目标和背板的夹角

    Figure 1.  The model of infrared radiation. $ {\theta _O} $ and $ {\theta _B} $ are the incidence angle of the object and the background plate respectively; $ {\alpha _{O\_B}} $ is the angle between the object and the background plate

    图 2  微面元模型几何关系

    Figure 2.  Geometric relationships of Micro-surface model

    图 3  辐射耦合效应对目标偏振度的影响。(a)s, p方向的反射率;(b)目标偏振度;(c)目标的辐射偏振度和反射偏振度

    Figure 3.  Influence of RCE on the DoLP of object. (a) Reflectance of the s-polarized and p-polarized components; (b) DoLP of the object; (c) the DoLP of reflection and emission

    图 4  温度对目标偏振度的影响。(a)目标偏振度;(b)$ {S_0} $分量;(c)$ {S_1} $分量

    Figure 4.  Influence of temperature on the DoLP of the object. (a) the DoLP of the object; (b) the$ {S_0} $component of the object; (c) the $ {S_1} $component of the object.

    图 5  目标偏振度图像,(从上到下,目标温度分别为30 °C,40 °C,50 °C;从左到右$ {\alpha _{O\_B}} $为87°-141°, 最右侧一列为无辐射耦合效应实验结果)

    Figure 5.  The DoLP images of the object. Up to down, the object temperatures are 30°C, 40°C and 50°C. Left to right, $ {\alpha _{O\_B}} $ are from 87° to 141°. The rightmost column is the DoLP images without RCE

    图 6  不同温度下的目标偏振度。(a)仿真与实验结果对比;(b)30 °C对比结果;(c)40 °C对比结果;(d)50 °C对比结果

    Figure 6.  The DoLP of the object at different temperatures. (a) comparison between the simulation results and the experimental results; (b) comparison results at 30 ° C; (c) comparison results at 40 ° C; and (d) comparison results at 50 ° C

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