变基线大气能见度测量系统

Variable Baseline Atmospheric Visibility Measurement System

针对传统大气透射仪收发基线固定、采样空间有限、透过率模型适用性差等问题,设计了一种变基线大气能见度测量系统。该系统的激光发射单元固定,光学接收单元可移动,能在不同基线长度上获得大气透过率。通过测量多点大气透过率并进行最小二乘拟合,得到大气消光系数和大气能见度。在大气能见度分别为200,800,2000 m时,对本系统和传统大气透射仪进行了仿真实验。结果表明,本系统测量得到的大气消光系数均方根误差均低于传统大气透射仪,可以有效减小系统误差和随机误差对测量结果的影响。在大气模拟舱内开展的外场实验也验证了本系统的有效性和稳定性。

In order to solve the problems of traditional atmospheric transmissometer,such as fixed transmitting-receiving baseline,limited sampling space,and poor applicability of transmittance model,a variable baseline atmospheric visibility measurement system is designed in this work.The laser emission unit of the system is fixed,while the optical receiving unit is movable,so the atmospheric transmittance can be obtained at different baseline lengths.By measuring the multi-point atmospheric transmittance and using the least square fitting,the atmospheric extinction coefficient and the atmospheric visibility can be obtained.Simulation experiments of the proposed system and the traditional transmissometer are carried out under the atmospheric visibility conditions of 200,800,and 2000 m.The results show that the root mean square error of atmospheric extinction coefficient measured by the proposed system is less than that of the traditional transmissometer,which effectively reduces the influence of system error and random error on the measurement results.The effectiveness and reliability of the system are verified by the external field experiment in the atmosphere environment simulation chamber.