紫外激光雷达同时反演臭氧分子数密度和气溶胶光学参数  

Simultaneous Retrieval of Ozone Concentration and Aerosol Optical Parameters using Ultraviolet LiDAR

作　　者：麻晓敏 单会会 张辉 曹开法 韩佳佳 王申浩 赵少卿 黄玲玲 陶鹏宇 张长江 陶宗明 Cao Kaifa;Han Jiajia;Wang Shenhao;Zhao Shaoqing;Huang Lingling;Tao Pengyu;Zhang Changjiang;Tao Zongming(Department of Basic Sciences,Army Academy of Artillery and Air Defense,Hefei 230031,Anhui,China;Anhui Kechuang Zhongguang Technology Co.,Ltd.,Hefei 230037,Anhui,China)

机构地区：[1]陆军炮兵防空兵学院基础部,安徽合肥230031 [2]安徽科创中光科技股份有限公司,安徽合肥230037

出　　处：《激光与光电子学进展》2024年第12期74-80,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(41975026)。

摘　　要：气溶胶是大气污染物的主要成分,而大气中的臭氧对人体健康也有一定影响,激光雷达是探测大气的强有力工具。臭氧在波长小于320 nm的紫外光波段吸收较强,若用波长小于320 nm的紫外激光探测气溶胶,会造成气溶胶吸收、臭氧吸收和大气分子吸收相互影响,使得从紫外激光雷达方程中反演气溶胶光学参数比从可见光激光雷达方程中反演更复杂。设计了双波长紫外激光雷达探测系统,获得两个波长上的紫外激光雷达回波信号,提出以臭氧分子数密度廓线为约束条件,运用迭代算法从两个紫外激光雷达方程中同时反演臭氧分子数密度廓线和气溶胶光学参数廓线的算法。为了验证所提反演算法的正确性,利用安徽科创中光科技股份有限公司已被校正的三波长紫外臭氧激光雷达与本课题组的双波长紫外激光雷达进行同时同地探测,对两者反演的臭氧分子数密度廓线进行对比分析,相对误差小于13%,在此基础上利用本探测系统进行连续10 h的大气探测,并将近地面反演的臭氧分子数密度与国控站探测的臭氧分子数密度进行对比分析,两者相对误差均小于17.6%。两个对比实验结果表明,所提反演算法是可行的、可靠的。Aerosols are the main components of air pollutants,and ozone also has a certain impact on human health.Light detection and ranging(LiDAR)is a powerful tool for detecting the atmosphere.Ozone has a strong absorption in the ultraviolet(UV)band with a wavelength less than 320 nm.Using UV laser(with a wavelength less than 320 nm)to detect aerosols will cause mutual effects between aerosol absorption,ozone absorption,and atmospheric molecular absorption.Consequently,retrieving aerosol optical parameters from the UV LiDAR equation will be more complex than that from the visible LiDAR equation.A dual-wavelength UV LiDAR detection system was designed to obtain UV LiDAR echo signals at two wavelengths.An iterative algorithm was proposed to simultaneously invert the ozone concentration profile and aerosol optical parameter profile from the two LiDAR equations,with ozone concentration profile as the constraint condition.The calibrated three-wavelength UV ozone LiDAR of Anhui Kechuang Zhongguang Technology Co.,Ltd.,and the dual-wavelength UV LiDAR of our group were used to verify the correctness of the proposed inversion algorithm in the same place at the same time.The ozone concentration profiles retrieved by the two LiDARs were compared and analyzed,with a relative error less than 13%.Based on this,the designed dual-wavelength UV LiDAR detection system was used to detect atmospheric for continuous 10 h.The process involved comparing and analyzing the ozone concentration retrieved near the ground with ozone concentration detected by national control stations.The relative errors of both are less than 17.6%.The results of the two comparative experiments indicate that the proposed inversion algorithm is feasible and reliable.

关 键 词：气溶胶 臭氧 反演方法 紫外光激光雷达 光学参数 

分 类 号：TN958.98[电子电信—信号与信息处理] P407.5[电子电信—信息与通信工程]