车载式激光雷达测量大气水平能见度
Mobile lidar for visibility measurement
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摘要: 激光雷达作为一种新型的大气观测工具，可以通过直接探测激光与大气相互作用的光辐射信号来定量地反演大气水平能见度，更好地反映大气对传输于其中激光的衰减作用，从而成为测量大气水平能见度的主要手段。简单介绍了自行研制的国内首台车载式拉曼-米(Raman-Mie)散射激光雷达的结构和技术参数，并利用斜率法从激光雷达的采集数据中反演出大气水平能见度。通过实际观测并与美国Belfort能见度仪的对比试验，显示该激光雷达在探测大气水平能见度方面具有较高的可靠性和准确性，其测量误差小于20 %。Abstract: As a new tool to detect atmosphere, lidar can derive the value of visibility by directly collecting the scatterd laser from the atmosphere. It makes lidar become a main instrument for measuring visibility. The schematic diagram and key parameters from the mobile Raman-Mie scattering lidar (RML) are given, and the slope method for getting visibility from data collected by lidar is presented.A practical experiment is conducted in Mianyang and the result is compared with that by Belfort visibility sensor.The results show that RML lidar has high reliability and is precise. The error of the measurement is less than 20%．
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Key words:
- lidar /
- visibility /
- extinction /
- aerosol
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