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分别采用532 nm和355 nm瑞利散射激光雷达对合肥地区25~40 km高度大气密度、压力和温度垂直分布进行了探测。532 nm瑞利激光雷达系统采用532 nm波长Nd:YAG激光器及400 mm口径卡塞格林型望远镜。355 nm瑞利激光雷达系统在532 nm瑞利激光雷达系统上进行改进,采用355 nm波长Nd:YAG激光器及4只400 mm口径卡塞格林型望远镜。通过实验对比得出,355 nm激光雷达系统信噪比高于532 nm激光雷达系统约6倍。355 nm激光雷达系统大气密度及压力探测值与当日气球探空数据比值波动小于532 nm激光雷达系统。355 nm激光雷达系统探测大气温度与当日气球探空数据偏差均值约为-2.14 K,最大温度偏差约为6 K,532 nm激光雷达系统探测大气温度与当日气球探空数据偏差均值约为-6.98 K,最大温度偏差约为9 K。两台激光雷达对比实验说明,改进的355 nm激光雷达系统对中层大气密度、压力和温度探测精度要高于532 nm激光雷达系统,改进的355 nm激光雷达系统探测性能优于532 nm激光雷达系统。
The atmospheric vertical distributions of atmospheric densities, pressures and temperatures at 25 ~ 40 km in Hefei were detected by 532 nm and 355 nm Rayleigh-scattering lidar respectively. The 532 nm Rayleigh Lidar system uses a 532 nm Nd: YAG laser and a 400 mm Cassegrain telescope. The 355 nm Rayleigh Lidar system was modified on a 532 nm Rayleigh Lidar with a 355 nm wavelength Nd: YAG laser and four 400 mm Caltaglin telescopes. The experimental results show that the SNR of the 355 nm LIDAR system is about 6 times higher than that of the 532 nm LIDAR system. 355 nm Lidar system atmospheric density and pressure measurements on the same day and the value of the balloon sounding data fluctuations less than 532 nm laser radar system. The deviation between the detected atmospheric temperature and the sounding data of the balloon on the 355 nm LIDAR system is about -2.14 K and the maximum temperature deviation is about 6 K. The deviation between the detected atmospheric temperature of the 532 nm Lidar system and that on the same day is about -6.98 K, the maximum temperature deviation of about 9 K. Compared with the 532 nm laser radar system, the improved 355 nm laser radar system has higher detection accuracy of mid-layer atmospheric density, pressure and temperature than the 532 nm laser radar system. The improved 355 nm laser radar system has better detection performance than the 532 nm laser radar system .