Study on Solar-Blind Effect in Ultraviolet Ozone Laser Radar

1.项目目的利用高功率紫外准分子激光器的差分吸收臭氧激光雷达（Lidar）是一种测量大气臭氧分布的强有力技术，目前已在各地建成了大尺度的臭氧激光雷达。本项目的目标是评估平流层臭氧的日盲效应对白天臭氧观测信噪比的改善，并开发一种移动的臭氧激光雷达系统，通过该系统可以进行昼夜测量.（1）从理论和实验两方面得到了对日盲效应有重要意义的天空辐射谱，并证明了光栅单色器可用于日盲滤光器。(2)基于激光雷达方程，计算了信噪比、最佳透射波长和探测距离。(3)采用紧凑型KrF激光泵浦拉曼激光器和250 mm双望远镜，研制了一套紧凑型日盲臭氧激光雷达系统。(4)使用该系统，臭氧分布高达3公里，通过白天和黑夜在现场进行了测量。(5)仿真结果表明，该系统作为机载激光雷达的探测距离可达10 km。

1. Objective of ProjectThe differential absorption ozone laser radar (lidar) used high-power UV excimer lasers is a powerful technique to measure the atmospheric ozone distribution, and large-scale ozone lidars have been built up in various places. The objective of this project is to evaluate the improvement in the SN ratio for daytime observation of ozone by the Solar-blind effect due to the stratospheric ozone, and to develop a mobile ozone lidar system by which measurements through day and night are possible.2. Results of Project(1) The radiation spectrum of the sky, which is important to evaluate the solar-blind effect, was obtained theoretically and experimentally, and it was shown that a grating monochromator was usable for a solar-blind filter.(2) Based on the lidar equation, the SN ratio, the optimum transmission wavelength and the detection range were evaluated.(3) A compact solar-blind ozone lidar system was developed with a compact KrF laser pumped Raman laser and a 250 mm twin telescope.(4) Using this system, the ozone distribution up to 3 km was measured through day and night in the field.(5) The characteristics of this system as an air-borne lidar were evaluated by the simulation code, and it was shown that the detection range can be extended to 10 km.