米散射激光雷达气溶胶反演精度的影响因素研究
Study on Influencing Factors of Mie Scattering Lidar Aerosol Inversion Accuracy
赵瑞安 1高天元 1衣文索 1李东旭 1黄思樵1
作者信息
- 1. 长春理工大学光电工程学院,吉林长春 130022
- 折叠
摘要
针对传统大气探测激光雷达存在体积大、结构复杂的问题,设计一款小型离轴米散射激光雷达大气探测系统.首先,使用自行搭建的小型米散射激光雷达试验系统在长春地区进行24 h的连续大气探测,得到的大气气溶胶消光系数廓线的变化规律与当地实际情况相符合,证明此试验系统是可行的;其次,讨论影响气溶胶反演精度的各种因素,并采用恰当的方法去除背景噪声以提高反演精度,通过分析发现后向散射消光对数比k、边界值σm在一定范围内随着其取值的增大,气溶胶消光系数也随之增大,而激光雷达比Sa在一定取值范围内与大气气溶胶消光系数值是反比关系;最后,对系统重叠因子进行修正,一定程度上提高了近地面气溶胶的反演精度.
Abstract
This paper presents the design of a small off-axis meter-scattering lidar atmospheric detection system to address the issues of large volume and complex structure associated with traditional atmospheric detection lidar.Firstly,the self-built small-scale meter-scattering lidar experimental system was used to carry out 24-hour continuous atmospheric detection in Changchun,and the variation of the contour of the extinction coefficient of atmospheric aerosols is consistent with the actual lo-cal situation,which proved that the experimental system was feasible.Secondly,the various factors affecting the accuracy of aerosol inversion are discussed,and appropriate methods are used to remove background noise to improve the inversion accura-cy,and it is found that the backscatter extinction logarithmic ratio k and boundary value σm increase with the increase of its val-ue within a certain range,and the lidar ratio Sa is inversely proportional to the atmospheric aerosol extinction coefficient value within a certain value range.Finally,the modification of the system overlapping factor is introduced to enhance the inversion accuracy of near-ground aerosols.
关键词
米散射/激光雷达/气溶胶/反演精度/消光系数Key words
Mie scattering/lidar/aerosol/inversion accuracy/extinction coefficient引用本文复制引用
基金项目
国家自然科学基金项目资助(61805022)
出版年
2024
NETL
NSTL
万方数据