摘要
为研制一台探测距离3km、分辨率10μg/m^3的大气NO_2廓线差分吸收激光雷达,以NO_2的吸收光谱和激光雷达方程为基础,通过数值仿真分析了回波信噪比与水平和垂直方向上大气中气溶胶、NO_2含量的分布、探测距离和几何因子的关系;搭建探测大气NO_2实验系统,开展了大气NO_2浓度实验观测,获得水平及垂直高度0.4km^3.0km内的NO_2浓度实时分布,探测分辨率可达4.717μg/m^3,系统稳定可靠。结果表明,采用两台波长为354.7nm、能量不小于100m J的Nd∶YAG激光器分别抽运两台染料激光器的方式,并以C450为染料,可满足差分吸收探测所需的两束波长为λ_(on)(448.10nm)和λ_(off)(446.80nm)、能量为8mJ的输出光束。该方法为实用化NO_2差分吸收激光雷达光源的设计及应用提供了理论依据及技术支持。
To develop an atmospheric NO2 differential absorption lidar（ DIAL） with detection range of 3 km and resolution of 10μg/m3,based on NO2 absorption spectrum and lidar equation,the relationships among echo signal-to-noise ratio（ SNR）,aerosol of the horizontal and vertical direction,NO2 concentration,detection distance and geometric factor were analyzed and simulated. The atmospheric NO2 experiment system was built,and the atmospheric NO2 concentration experiment was carried out. The NO2 concentration in horizontal and vertical height of 0. 4 km 3. 0 km was obtained in real time,and the resolution was up to 4. 717μg/m3. The system was stable and reliable. The results show that,with two Nd∶YAG lasers with wavelength of 354. 7 nm and laser energy not less than 100 mJ to pump two dye lasers with C450 as the dye,two output light beams for differential absorption detection can be obtained with λ（on） of 448. 10 nm,λ（off） of 446. 80 nm,and energy of 8 mJ. This method provides theoretical basis and technical support for the design and application of practical NO2 differential absorption lidar light sources.
作者
刘秋武
陈亚峰
王杰
王晓宾
曹开法
黄见
胡顺星
LIU Qiuwu;CHEN Yafeng;WANG Jie;WANG Xiaobing;CAO Kaifa;HUANG Jian;HU Shunxing(Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;School of Physics and Electronic Engineering,Hanshan Normal University,Chaozhou 521041,China)
出处
《激光技术》
CAS
CSCD
北大核心
2018年第4期433-439,共7页
Laser Technology
基金
国家重大科研仪器设备研制专项资助项目(41127901)
国家自然科学基金资助项目(41575032)
