探测低空大气温度分布的转动拉曼激光雷达  

Rotational Raman lidar for atmospheric temperature profiles measurements in the lower-air

作　　者：刘玉丽[1] 张寅超[1] 苏嘉[1] 岳古明[1] 周军[1] 胡欢陵[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所大气光学重点实验室

出　　处：《光电工程》2006年第10期43-48,共6页Opto-Electronic Engineering

摘　　要：提出了一种新的探测对流层低层大气温度的转动拉曼激光雷达方法,通过测量N2和O2的后向散射的纯转动拉曼谱的强度,计算它们的比值来确定大气温度的垂直分布,并对其性能进行了数值模拟。转动拉曼激光雷达的光源是一个调Q的Nd:YAG激光器,经扩束器后输出能量200mJ;采用双光栅单色仪提取所需要的氮气和氧气的转动拉曼谱;接收机采用光电倍增管和双通道光子计数器,量子效率是10%(48000个脉冲累加)。夜晚它对近地面10.2km高度内的探测信噪比在10:1以上,白天它对近地面3.6km高度内的探测信噪比在10:1以上,计算的温度与模拟用的温度真值阔线相差约0.3K。Rotational Raman lidar technique was introduced to measure atmospheric temperature in the lower-air in this paper. A rotational Raman lidar detects the rotational-Raman backscattering signals of N2 and O2 in the atmosphere. By calculating ratio between two return signals, atmospheric temperature vertical profiles can be derived, the performance of this lidar was simulated. The transmitter of rotational Raman lidar is a Q-switched Nd：YAG laser with a output energy of 200mJ by a beam expander. We filter out the necessary portions of pure rotational Raman spectra of molecular nitrogen and oxygen with a double grating monochromator. The receiver employs double channel photo counter and photomultiplier tube with quantum efficiency of 10%.Signal simulations indicate that Signal-to-Noise Ratio （SNR） below 10.2km is more than 10：1（48000 pulse） during night-time and it below 3.6km is more than 10：1 during day-time. The calculated temperature profiles with this technique agreed with the introduced real temperature profiles within 0.3K.

关 键 词：拉曼激光雷达 大气激光探测 大气温度 光栅单色仪 

分 类 号：TN958[电子电信—信号与信息处理] P412[电子电信—信息与通信工程]