摘要
天空向下热红外辐射具有随时空变化而变化的特性,当扫描傅里叶变换红外遥测成像系统以天空为背景对目标气云进行成像扫描时,各扫描像素对应的背景辐射差异较大且没有恒定的基线,因而影响目标气云透过率的精确反演.针对这类问题,提出了基于大气廓线合成背景的目标气云透过率反演方法,首先采用实测地点的温度、湿度、压强和臭氧廓线及大气模式生成天空红外背景,以解决化工园区内难以实时测量纯净天空红外背景谱的问题,其次验证了天空红外背景与天顶角余弦逐波数存在连续可导的关系,使得少量具有天顶角梯度的天空红外背景即可快速插值生成任意仰角位置的天空红外背景谱.本文以中分辨率大气辐射传输模型(MODTRAN)软件仿真和SF6气体的遥测成像实验进行了方法验证,所提方法可以快速生成梯度仰角内任意角度对应的天空红外背景谱,准确反演出各扫描像素的目标气云透过率,反演得到的SF6柱浓度气云分布与实际分布一致,相关性达到0.99979.
The sky infrared background radiation varies greatly with spatial distribution and time.When scanning Fourier transform infrared remote sensing imaging system scans the target gas cloud with the sky as the background,the background radiation corresponding to each scanned pixel is different,and the background does not have a constant baseline.It is extremely difficult to obtain the background spectrum of each pixel in real time,which affects the inversion accuracy of the target gas cloud transmittance.An inversion method of target gas cloud transmittance based on atmospheric profile synthesis background is proposed in this work.The temperature,humidity,pressure,and ozone profiles of the measured locations and the atmospheric model are used to generate the sky infrared background in order to solve the problem,i.e.the difficulty in measuring the clean sky infrared background spectrum in the chemical industry park.This paper proposes that there is a continuous derivable relationship between the sky infrared background spectrum and the cosine of zenith angle at each wavenumber,so a small amount of sky infrared ba.ckground spectrum with a zenith angle gradient can quickly generate a sky infrared background spectrum at any elevation angle.The proposed method is verified by the moderate resolution atmospheric radiative transfer model(MODTRAN)software simulation and the remote sensing imaging experiment of SF6gas.The proposed method can quickly generate the sky infrared background spectrum corresponding to any angle within a gradient elevation angle and accurately invert the target gas cloud transmittance at each pixel.The results show that the distribution trend of the column concentration of the SF6gas cloud is consistent with the actual distribution,and the correlation is 0.99979.
作者
胡运优
徐亮
沈先春
束胜全
徐睆垚
邓亚颂
徐寒扬
刘建国
刘文清
Hu Yun-You;Xu Liang;Shen Xian-Chun;Shu Sheng-Quan;Xu Huan-Yao;Deng Ya-Song;Xu Han-Yang;Liu Jian-Guo;Liu Wen-Qing(Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第3期52-61,共10页
Acta Physica Sinica
基金
国家自然科学基金(批准号:41941011,52027804)
安徽省重点研发计划(批准号:2022m07020009)资助的课题。
关键词
傅里叶变换红外光谱
合成背景
透过率反演
气云扫描成像
Fourier transform infrared spectroscopy
synthetic background
transmittance inversion
gas cloud scanning imaging
