Model of near-space limb contrast based on non-local thermodynamics equilibrium model
Received:February 17, 2017  Revised:April 13, 2017  download
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Author NameAffiliationE-mail
LIU Dong Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences ldwl2012@mail.ustc.edu.cn 
DAI Cong-Ming Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences cmdai@aiofm.ac.cn 
TANG Chao-Li Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences  
WU Peng-Fei Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences  
LIU Zheng Science and Technology on Optical radiation Laboratory, Beijing Institute of Environmental Feature  
MAO Hong-Xia Science and Technology on Optical radiation Laboratory, Beijing Institute of Environmental Feature  
WEI He-Li Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences hlwei@aiofm.ac.cn 
Abstract:A physical model was established for studying near-space limb radiance contrast when the target is detected by space-borne infrared surveillance system. The definition of limb contrast and radiation issues of upper atmosphere of the model was described in detail. The target’s limb contrasts were simulated and analyzed to show upper atmospheric radiation properties’ effects to the target visibility based on non-local thermodynamics equilibrium atmospheric model and assumed detector’s noise. The results indicate that the detector’s noise must be considered for evaluating surveillance feasibility correctly. The contrast at the traditional waveband of the strong absorption by water vapor is better than the often-used ‘atmospheric windows’ for the upper atmospheric limb detection. The complicated contrast characteristics result from the relationship among target inherent radiation, atmospheric absorption and background radiation.
keywords:atmospheric optics  infrared radiation  non-local thermodynamics equilibrium  near-space  limb contrast
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Copyright:《Journal of Infrared And Millimeter Waves》