All day measurements of atmospheric temperature and water vapor concentration in the boundary layer by a Raman lidar

研制了一套能够在背景光强的白天（1 ~ 2km高度）测量大气温度和水汽浓度垂直分布的拉曼激光雷达系统。窄带通滤波器和波长可调谐激光器的研制是本研究的重要技术。为实现窄带通滤光，研制了原子气色散法拉第滤光片。利用钠法拉第滤光片测量了白天的背景光强度。在有云的情况下，背景光相当大。波长可调谐激光器选择染料激光器和钛蓝宝石激光器。研制了用于测量水汽的振动拉曼激光雷达和用于测量温度的旋转拉曼激光雷达。最后通过计算机模拟对白天测量的可能性进行了评价。

Raman lidar system which can measure vertical distribution of air temperature and water vapor concentration even in the daytime with much background light in planetary boundary layer (1-2km altitude) was developed. Important techniques in this study are development of narrow bandpass filter and wavelength-tunable laser. Atomic vapor dispersive Faraday filter was developed to realize narrow bandpass filter. Using the sodium Faraday filter, the background light strength in the daytime was measured. The background light is quite large under the condition of the cloud. Dye laser and Ti: sapphire laser are chosen for wavelength-tunable laser. The vibratlonal Raman lidar for water vapor measurement and rotational Raman lidar for temperature measurement were also developed. The final evaluation on possibility, of the daytime measurement was carried out with the computer simulation.