Abstract：NECL could be used to estimate the limit of detection of the infrared passive remote sensing system. It was an important indicator of the sensitivity of the system. The theoretical equation of the NECL according to the atmospheric infrared radiation transfer model showed that NECL related to NESR, the brightness temperature of background and pollution gas, and the absorption coefficient of pollution gas. The remote sensing of SF6 was done. The limit of detection of the system at the different brightness temperature of background and pollution gas could be calculated. False color image of NECL was given from the measured data. The results show that NECL decreases rapidly by increasing the difference in brightness temperature of the background and pollution gas, the value of NECL was down to 10-2 order of magnitude when the brightness temperature difference was equal to 30 K. False color image of NECL contributes to the discrimination of the limit of detection of the system in the complex background.
Key words：FTIR;Passive remote sensing;NECL;Brightness temperature
焦 洋，徐 亮*，高闽光，金 岭，童晶晶，李 胜，魏秀丽 . 污染气体扫描成像红外被动遥测系统的检测下限研究 [J]. 光谱学与光谱分析, 2013, 33(10): 2617-2620.
JIAO Yang, XU Liang*, GAO Min-guang, JIN Ling, TONG Jing-jing, LI Sheng, WEI Xiu-li . Investigation of the Limit of Detection of an Infrared Passive Remote Sensing and Scanning Imaging System for Pollution Gas . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(10): 2617-2620.
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