基于MODTRAN模型使用被动傅里叶变换红外光谱技术对生物气溶胶的探测研究
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摘要
利用MODTRAN模型在水平低仰角探测模式下,对生物气溶胶探测的问题进行了分析讨论.用傅里叶变换红外(FTIR)光谱技术对生物气溶胶进行探测研究.首先介绍了MODTRAN模型的大气模式和廓线,根据FTIR光谱技术对生物气溶胶的被动探测要求,利用辐射传输理论和最简单的三层模型,仿真计算得到大气背景和目标生物气溶胶之间的辐射亮度差?L,然后对?L进一步差值得到信号?2Lt,同时再结合光谱仪自身的噪声等效辐射亮度值,得到实际情况下的信号值?2Lt;最后根据探测条件和MODTRAN提供的大气模式,使用被动遥测红外光谱方法预测每种大气模式下生物气溶胶的探测限浓度.每种大气模式下探测限浓度的不同,是因为边界层温度、透过率和背景辐射亮度的不同所导致,同时还与生物气溶胶的吸收系数有关.研究表明,FTIR光谱被动遥测技术能够探测到生物气溶胶的存在,进一步说明探测生物气溶胶的可行性,也为生物气溶胶实际探测提供了一种方法.
The problem of detecting the biological aerosol at low elevation angle is analyzed and discussed by using MODTRAN model. First of all, the atmospheric model and profile of MODTRAN model are introduced for the biological aerosol detection by Fourier transform infrared(FTIR) spectroscopy. According to the passive detection of biological aerosol by FTIR spectroscopy, the radiation brightness difference ?L between the background and the target biological aerosol is calculated by using the radiative transfer theory and the simplest three-layer model. The signal value ?2Lt under the actual circumstance is derived from the derivative of ?L combined with the noise equivalent spectral radiance value of the spectrometer. Finally, the detection limit of biological aerosol for each atmospheric mode is predicted with the passive remote sensing method. The limit concentration of detection for each atmospheric mode is different due to the differences in boundary layer temperature, transmittance, and background radiation brightness of atmospheric model,and it is also related to the absorption coefficient of biological aerosol. It is shown that the passive remote sensing of FTIR technology can detect the presence of the biological aerosol. Therefore, the detection of the biological aerosol is feasible. It presents a method of detecting the biological aerosol cloud under the actual circumstance.
The problem of detecting the biological aerosol at low elevation angle is analyzed and discussed by using MODTRAN model. First of all, the atmospheric model and profile of MODTRAN model are introduced for the biological aerosol detection by Fourier transform infrared(FTIR) spectroscopy. According to the passive detection of biological aerosol by FTIR spectroscopy, the radiation brightness difference ?L between the background and the target biological aerosol is calculated by using the radiative transfer theory and the simplest three-layer model. The signal value ?2Lt under the actual circumstance is derived from the derivative of ?L combined with the noise equivalent spectral radiance value of the spectrometer. Finally, the detection limit of biological aerosol for each atmospheric mode is predicted with the passive remote sensing method. The limit concentration of detection for each atmospheric mode is different due to the differences in boundary layer temperature, transmittance, and background radiation brightness of atmospheric model,and it is also related to the absorption coefficient of biological aerosol. It is shown that the passive remote sensing of FTIR technology can detect the presence of the biological aerosol. Therefore, the detection of the biological aerosol is feasible. It presents a method of detecting the biological aerosol cloud under the actual circumstance.
引文
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[15]Feng M C,Xu L,Gao M G,Jiao Y,Wei X L,Jin L,Chen S Y,Li X X,Feng S X 2012 Spectrosc.Spect.Anal.323193(in Chinese)[冯明春,徐亮,高闽光,焦洋,魏秀丽,金岭,程巳阳,李相贤,冯书香2012光谱学与光谱分析323193]
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[2]Gao M G,Liu W Q,Zhang T S,Liu J G,Lu Y H,Zhun J,Lian Y,Lu F 2005 Spectrosc.Spect.Anal.25 1042(in Chinese)[高闽光,刘文清,张天舒,刘建国,陆亦怀,朱军,连悦,陆钒2005光谱学与光谱分析25 1042]
[3]Marshall T L,Chaffin C T,Hammaker R M,Fateley W G 1994 Environ.Sci.Technol.28 224A
[4]Feng M C,Gao M G,Xu L,Chen S Y,Tong J J,Jin L,Li S,Wei X L,Li X X,Jiao Y,Liu W Q 2011 Laser Infrared 41 1201(in Chinese)[冯明春,高闽光,徐亮,程巳阳,童晶晶,金岭,李胜,魏秀丽,李相贤,焦洋,刘文清2011激光与红外41 1201]
[5]Liu X,Murcray F J,Murcray D G,Russell J M 1996 J.Geophys.Res.Atmos.101 10175
[6]Oppenheimer C,Francis P,Burton M,Maciejewski A J H,Boardman L 1998 Appl.Phys.B 67 505
[7]Liu Z M,Liu W Q,Gao M G,Tong J J,Zhang T S,Xu L,Wei X L 2008 Chin.Phys.B 17 4184
[8]Ligon D A,Wetmore A E,Gillespie P S 2002 Opt.Express 10 909
[9]David A B,Ren H 2003 Appl.Opt.42 4887
[10]David A B 2003 Opt.Express 11 418
[11]Lan T G,Xiong W,Fang Y H,Li D C,Yuan Y M 2010Acta Opt.Sin.30 1656(in Chinese)[兰天鸽,熊伟,方勇华,李大成,袁越明2010光学学报30 1656]
[12]Berk A,Bernstein L S,Robertson D C 1989 Air Force Geophysics Laboratory GL-TR-89-0122 AD-A214 337
[13]Kneizys F X,Shettle E P,Abreu L W,Chetwynd J H,Anderson G P,Gallery W O,Selby J E A,Clough S A 1988 Air Force Geophysics Laboratory AFGL-TR-88-0177 AD-A206 773
[14]Flanigan D 1995 Appl.Opt.34 2636
[15]Feng M C,Xu L,Gao M G,Jiao Y,Wei X L,Jin L,Chen S Y,Li X X,Feng S X 2012 Spectrosc.Spect.Anal.323193(in Chinese)[冯明春,徐亮,高闽光,焦洋,魏秀丽,金岭,程巳阳,李相贤,冯书香2012光谱学与光谱分析323193]
[16]Wilmot D W,Owens W R,Shelton R J 1993 SPIE 7 57