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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。
Aiming at the measurement accuracy of laser atmospheric transmissometer with multiple scattering effects, the error analysis model of laser atmospheric transmissometer under different visibility conditions is proposed, which is affected by the length of baseline, the receiver angle of view and the effects of multiple scattering. Firstly, the atmospheric transmittance with and without elimination of multiple scattering was calculated by the Monte Carlo method and the Bouguer-Lamber law. Secondly, according to the simulation results, the influence degree of multiple scattering under different visibility conditions was analyzed. Finally, Baseline and variable receiver angle of view of the transmission instrument working principle, given the visibility error analysis model. The results show that the lower the visibility, the more serious the influence of multiple scattering on the measurement accuracy when using the laser atmospheric transmissometer to measure the visibility, the selection of the appropriate baseline length and receiver angle of view to reduce the measurement error caused by multiple scattering are Significance.