中国激光, 2014, 41(9): 0908005, 网络出版: 2014-09-01

新型微脉冲激光雷达测量大气水平能见度

A New Micro-Pulse Lidar for Atmospheric Horizontal Visibility Measurement
作者单位

中国科学院安徽光学精密机械研究所环境光学与技术重点实验室, 安徽 合肥 230031

摘要
重点设计了微脉冲激光雷达(MPL)系统的后继光学单元,是一种新型的设计。使用收发一体Y型光纤束改变传统的激光雷达后继光学结构,实现系统的收发同轴设计。分析了新型微脉冲激光雷达在合肥地区实验观测结果,利用分段斜率法反演气溶胶水平消光系数,获得了大气能见度及变化特征,具有明显的日变化特征,并与HW-N1型前向散射式能见度仪测量结果进行了对比,二者相关系数达到0.81。此外,理论误差分析结果也表明当能见度在10 km以下时MPL的测量误差小于20%。说明了该MPL系统能够实现对大气水平能见度的有效测量。
Abstract
A new micro-pulse lidar (MPL) system used for atmospheric horizontal visibility measurement is developed, especially the optical unit. The system uses a Y-fiber bundle instead of mirrors in the traditional lidar system, not only improving the compact of the structure, but also solving the problem that is always very difficult to adjust the transmitting and receiving optical paths to parallel in the traditional system, so that it can avoid the influence of the geometrical overlap factor and reduce the complexity of the data processing. This paper analyzes the experimental results of the new MPL in Hefei, and uses the sub-slope method invert aerosol extinction coefficients to obtain atmospheric visibility and its variation. According to the results, the atmospheric visibility has a clear diurnal variation. The correlation coefficient between the results and the other measured by HW-H1 gype forward scatter visibility instrument is 0.81. In addition, the theoretical error analysis results also show that MPL measurement error is less than 20% when the visibility is less than 10 km, indicating that MPL system can achieve the measurement of the atmospheric horizontal visibility effectively.
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