相干差分吸收二氧化碳激光雷达仿真与误差分析  

Simulation and Error Analysis of Coherent Differential Absorption Carbon Dioxide Lidar

作　　者：李因营 陈相成 于翠荣 戴光耀[1] 吴松华[1,3,4] Li Yinying;Chen Xiangcheng;Yu Cuirong;Dai Guangyao;Wu Songhua(College of Marine Technology,Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,Shandong,China;Qingdao Leice Transient Technology Co.,Ltd.,Qingdao 266101,Shandong,China;Laoshan Laboratory,Qingdao 266237,Shandong,China;Institute for Advanced Ocean Study,Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]中国海洋大学信息科学与工程学部海洋技术学院,山东青岛266100 [2]青岛镭测创芯科技有限公司,山东青岛266101 [3]崂山实验室,山东青岛266237 [4]中国海洋大学海洋高等研究院,山东青岛266100

出　　处：《光学学报》2024年第6期145-156,共12页Acta Optica Sinica

基　　金：崂山实验室科技创新项目(LSKJ202201202);青岛市新兴产业培育计划(22-3-4-xxgg-8-gx)。

摘　　要：阐述了相干差分吸收激光雷达(CDIAL)探测大气二氧化碳(CO_(2))的原理,设计了1.57μm波段微脉冲相干探测系统,并对系统的回波信号进行了仿真。通过仿真计算分别探究了温度、压力、波长等因素对差分光学厚度计算及CO_(2)体积分数的反演精度的影响。仿真结果显示:当波长漂移为0.5 pm、温度不确定度为1 K、压强不确定度为1 h Pa、水汽体积分数测量不确定度为10%时,这些参数引起的总体误差为0.45%;在大气中CO_(2)的体积分数为4×10^(-4)时,微脉冲相干激光雷达探测CO_(2)体积分数的测量误差约为1.8×10^(-6)。Objective Since the middle of the 20th century,due to the greenhouse effect,the global average surface temperature has increased by 0.85℃ between 1880 and 2012,and larger scale temperature increases have been investigated in some regions.Atmospheric carbon dioxide,as one of the important gases causing the greenhouse effect,plays an important role in global climate change.Due to the characteristics of large emissions and easy accumulation,carbon dioxide is often used as the main indicator of energy conservation and emission reduction.Understanding the spatiotemporal distribution pattern of atmospheric CO_(2) concentration in different regions can help to grasp the footprint of the source and sink of CO_(2) gas,which is conducive to achieving emission reduction control in China and accelerating the high-quality development of green and low carbon.The traditional methods of observing CO_(2) concentration use various meteorological satellites equipped with passive remote sensing observation instruments to observe the global large-scale CO_(2) concentration.However,passive remote sensing is limited by its observation characteristics,and there are problems such as difficult measurement at night,poor detection performance in high latitude regions,vulnerability to clouds and aerosols,and insufficient nearsurface CO_(2) observation accuracy.As one of the active remote sensing technologies,coherent differential absorption lidar technology can work all day and detect with high accuracy.Compared to ground-based or airborne CO_(2) column concentration observation methods,it can provide CO_(2) concentration profile observation results with higher resolution.This observation method combines two technical systems,i.e.,optical heterodyne and differential absorption,and can achieve high sensitivity,high integration,and diversified detection of atmospheric parameters.Coherent differential absorption lidar can obtain information about the vertical profile of carbon dioxide concentration and has the ability to detect point sources,

关 键 词：大气光学 二氧化碳体积分数 相干差分吸收 激光雷达 仿真与性能评估 

分 类 号：TN958.98[电子电信—信号与信息处理] TN249[电子电信—信息与通信工程]