摘要
地球大气与气候变化密切相关,且影响着人类健康和生态环境,大气监测具有重要意义。大气气溶胶散射辐射的偏振敏感性为光学偏振遥感技术应用于大气探测提供了新思路。结合我国航空遥感系统技术发展和环境大气遥感监测需求,提出了一种航空大气多角度偏振探测方法,突破集束式偏振光学系统设计和偏振定标等关键技术,研制了大气多角度偏振辐射计。首先,介绍辐射计偏振探测原理,讨论光学系统方案设计,分析辐射计多角度探测和定标精度对气溶胶柱浓度反演后验误差的影响;其次,利用标准偏振光发生器和绝对辐射定标系统,对辐射计偏振测量精度进行验证,并得到绝对辐射定标不确定度;再次,针对辐射计航空遥感模式,研发专门的多角度多光谱偏振探测数据处理系统;最后,开展外场实验分析,通过航空与地面同步观测实验,验证了辐射计各项指标。研究结果表明:辐射计的绝对辐射定标不确定度优于4%,偏振测量精度优于0.5%,同步比对站点的大气气溶胶光学厚度反演精度优于0.05。该辐射计获取的偏振数据可反演得到大气气溶胶光学厚度等参数,满足区域环境大气监测应用需求。
The Earth’s atmospheric conditions are closely related to climate change and affect human health and ecological environments.Therefore,atmospheric monitoring is of considerable importance.The polarization sensitivity of atmospheric aerosol scattering radiation provides a new idea for the application of optical polarization remote sensing technology for atmospheric detection.Combining the technical development of China’s aerial remote sensing system and the demand for environmental atmospheric remote sensing monitoring,an aerial atmospheric multi-angle polarization detection method is proposed.The key technologies include a cluster polarization optics system design,polarization calibration,etc.The atmospheric multi-angle polarimetric radiometer was developed.First,the polarization detection principle of this radiometer is introduced.Thereafter,the optical system solution design is discussed.The influence of multi-angle detection and calibration accuracy of the radiometer on the posterior error of atmospheric aerosol column concentration retrieval was analyzed.Next,using the standard polarized light generator and the absolute radiometric calibration system,the polarization measurement accuracy of the radiometer was verified,and the absolute radiometric calibration uncertainty was obtained.Next,the special multi-angle and multi-spectral polarization detection data processing system was developed for radiometer airborne remote sensing mode.Finally,the field experimental analysis was conducted.The specifications of the radiometer were verified via aerial flight campaigns and ground-based synchronous observation experiments.The results show that the absolute radiation calibration uncertainty of the radiometer is better than 4%.The polarization measurement error was less than 0.5%,and the aerosol optical thickness retrieval error at the synchronous comparison site was less than 0.05.The polarization data measured by the radiometer can be retrieved to obtain atmospheric aerosol optical thickness and other parameters,
作者
孙晓兵
宋茂新
吴洋
张爱文
提汝芳
SUN Xiaobing;SONG Maoxin;WU Yang;ZHANG Aiwen;TI Rufang(Hefei Institutes of Physical Science,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;Key Laboratory of Optical Calibration and Characterization,Chinese Academy of Sciences,Hefei 230031,China;Hefei Agricultural Industry Chief Expert Studio,Hefei 230031,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2022年第22期2847-2859,共13页
Optics and Precision Engineering
基金
国家重点研发计划资助项目(No.2016YFE0201400)
国家重大基础设施建设项目——航空遥感系统建设项目(No.O93AG44551)
航天科技创新应用研究项目(No.E23Y0H555S1)。
关键词
航空
偏振
遥感
多角度
辐射计
aviation
polarization
remote sensing
multi-angle
radiometer
