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拉曼散射法测量大气二氧化碳(CO2)是一种利用大气中CO2分子和N2分子与激光相互作用产生Raman散射频移来实现探测CO2混合比分布的探测技术。介绍了中国科学院安徽光学精密机械研究所自主研制的拉曼散射激光雷达系统,以及用于大气CO2时空间分布测量的原理和方法。将两台事先校准过的CO2分析仪布置在激光雷达水平光路的发射端和1km位置进行同时测量,实验结果表明:两台分析仪分别与激光雷达近端和远端得到的CO2混合比随时间的变化具有较好的一致性,统计一整夜测量结果的平均值分别相差0.8ppm和3.51ppm;结合激光光路下垫面的不同对近端与远端结果的差异进行了分析说明,充分表明了拉曼散射激光雷达测量结果的可靠性。
Raman scattering method to measure atmospheric carbon dioxide (CO2) is a detection technique that utilizes the Raman scattering frequency shift of CO2 molecules in the atmosphere and N2 molecules to interact with the laser to detect the CO2 mixture ratio distribution. The Raman scattering lidar system independently developed by Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, as well as the principle and method for measuring the spatial distribution of atmospheric CO2 are introduced. The two pre-calibrated CO2 analyzers were arranged at the transmitter and the 1km positions of the laser light level optical path. The experimental results show that the CO2 mixtures obtained by the two analyzers with the near and far ends of the laser radar, respectively, The results showed that the average values of the overnight measurements were 0.8ppm and 3.51ppm, respectively. The differences between the proximal and distal results of the lamellar surfaces under the laser light path were analyzed and fully demonstrated Reliability of Raman scattering lidar measurements.