中文摘要：

针对多次散射影响激光大气透射仪的测量精度问题,提出了不同能见度条件下的激光大气透射仪受基线长度、接收机视场角以及多次散射影响的误差分析模型。首先,通过Monte Carlo法和Bouguer-Lamber定律计算了消除和未消除多次散射的大气透过率;其次,根据仿真结果,对不同能见度条件下多次散射影响程度进行分析;最后,结合可变基线与可变接收机视场角的透射仪工作原理,给出能见度误差分析模型。结果表明,应用激光大气透射仪进行能见度测量时,能见度越低,多次散射对测量精度的影响越严重,选取适当的基线长度和接收机视场角对减小多次散射引起的测量误差有重要意义。

英文摘要：

The influence of multiple scattering on laser-transmissometer visibility measurement accuracy is analyzed in detail in this paper. And a model of error analysis under different values of both low and high visibility is put forwardfor the laser-transmissometer affected by the length of baseline length, the value of receiver field of view and the level of multiple scattering. For both of the two cases,removing and not removing the multiple scattering part in the total received light energy, the atmospheric transmittance values are calculated by both Monte Carlo method and Bouguer-Lambert＇s law. Then, according to the curves of the transmittance derived from the simulation results, the paper analyzes the influence of multi- pie scattering under different values of both low and high visibility. Finally, combining with the working principle of variable length of baseline and variable value of receiver field of view, the visibility error a- nalysis model for the laser-transmissometer is given. The simulation results show that in low visibility atmosphere, the influence of multiple scattering on the visibility measurement accuracy is considerable, while it can be effectively inhibited by selecting the appropriate length of baseline length and the appro- priate value of receiver field of view.