Rotational Raman lidar for detecting temperature profiles in boundary layer
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摘要: 为了研制一种测量边界层大气温度的激光雷达，采用氮气和氧气的转动喇曼谱的强度比反演大气温度垂直分布的方法，对转动喇曼激光雷达系统进行了理论分析与实验研究，取得了边界层内的大气温度数据。结果表明，该激光雷达测量的大气温度在0km~2.5km处与大气模式表现出了较好的一致性，激光能量为100mJ，测量时间约为17min，垂直分辨率为7.5m；2.5km处信号随机起伏引起的统计误差达到1K，可以对边界层内2.5km以下的大气温度进行高精度测量；如果要使测量的高度进一步增加，可以增大激光脉冲的能量或选用口径大的望远镜。这对探测边界层大气温度的转动喇曼激光雷达系统的研制提供了有益的指导。Abstract: In order to develop a lidar to measure temperature profiles in the planetary boundary layer, the vertical distribution of atmospheric temperature was retrieved based on the ratio of the rotational Raman spectrum intensity of nitrogen and oxygen. After theoretical analysis and experimental research of rotational Raman lidar system, the atmospheric temperature data in the boundary layer were obtained.The results show that, the atmospheric temperature measured by the lidar is in good agreement with atmospheric model in the range of 0km to 2.5km. The statistical error caused by random fluctuation of signal at 2.5km reaches 1K under the conditions of laser energy of 100mJ, measurement time of about 17min and vertical resolution of 7.5m. The atmospheric temperature below 2.5km within the boundary layer can be measured with high accuracy. The increase of laser pulse energy or the select of the telescope with large caliber would improve the height of the measurement further. The study provides the favorable guidance for development of rotational Raman lidar systems for detecting atmosphere temperature in boundary layer.
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Figure 2. Transmissivity curves of N2 by rotation Raman spectrum and double grating monochromator at different temperatures
Table 1 Basic parameters of rotational Raman lidar
system parameter value Nd:YAG wavelength 532nm pulse energy 100mJ pulse repetition frequency 10Hz receiver diameter 200mm field of view 200μrad gratings diffraction order 5 grating constant 600g/mm lens focal length 200mm input fiber core diameter 0.6mm output fiber core diameter 1.3mm PMT Hamamatsu/R7400U-03 amplifier Phillips 6954 transient recorder Licel vertical resolution 7.5m 
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