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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.
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Keywords:
- MODTRAN /
- Fourier transform infrared spectroscopy /
- passive remote sensing /
- biological aerosol
[1] Xu L, Liu J G, Gao M G, Lu Y H, Wei X L, Zhang T S, Zhu J, Chen J 2007 Spectrosc. Spect. Anal. 27 448 (in Chinese) [徐亮, 刘建国, 高闽光, 陆亦怀, 魏秀丽, 张天舒, 朱军, 陈军 2007 光谱学与光谱分析 27 448]
[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 2010 Acta 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. 32 3193 (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 32 3193]
[16] Wilmot D W, Owens W R, Shelton R J 1993 SPIE 7 57
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[1] Xu L, Liu J G, Gao M G, Lu Y H, Wei X L, Zhang T S, Zhu J, Chen J 2007 Spectrosc. Spect. Anal. 27 448 (in Chinese) [徐亮, 刘建国, 高闽光, 陆亦怀, 魏秀丽, 张天舒, 朱军, 陈军 2007 光谱学与光谱分析 27 448]
[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 2010 Acta 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. 32 3193 (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 32 3193]
[16] Wilmot D W, Owens W R, Shelton R J 1993 SPIE 7 57
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