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介绍了中国科学院安徽光学精密机械研究所研制成功的我国第一台测量低对流层大气CO2时空分布的拉曼激光雷达系统,选用波长355nm的紫外激光作为光源,利用光子计数卡双通道采集大气中N2和CO2的拉曼后向散射信号。详细分析了拉曼激光雷达系统的定标方法,提出采用Li7500型H2O/CO2分析仪与拉曼激光雷达系统进行对比与标定,结果显示激光雷达与CO2分析仪数据变化趋势一致性较好,激光雷达具有很高的探测灵敏度与准确性,通过线性拟合水平方向标定误差小于0.2%,垂直方向小于1.4%。由标定关系反演出大气中CO2的时空分布,给出了合肥西郊低对流层大气CO2水平方向0～2.0km与垂直方向0～2.5km分布的典型测量结果。
This paper introduces the first Raman lidar system in our country that was successfully developed by Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and measures the spatial and temporal distribution of atmospheric CO2 in the lower troposphere. The wavelength of 355nm is chosen as the light source. And CO2 Raman backscatter signals. The calibration method of Raman lidar system is analyzed in detail. The comparison and calibration between Raman lidar system and Li7500 H2O / CO2 analyzer are proposed. The results show that the trend of laser radar and CO2 analyzer is in good agreement. The laser Radar has high detection sensitivity and accuracy. The calibration error is less than 0.2% in the horizontal direction and less than 1.4% in the vertical direction by linear fitting. The spatial-temporal distribution of CO2 in the atmosphere is retrieved from the calibration relationship, and the typical measurement results of 0 ~ 2.5km horizontal distribution of 0 ~ 2.5km in the horizontal direction and 0 ~ 2.5km in the vertical direction in the lower troposphere of Hefei are given.