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研究了大气分子和云雾粒子对入射激光的吸收与散射效应.采用Kruse模型、单次散射近似法和蒙特卡洛法计算了谱分布参量不同的三种云雾对0.86μm波长激光的消光特性,结果表明:能见度小于0.5km时,Kruse模型不再适用于云雾消光系数的计算;能见度相同时,消光系数的单次散射近似结果大于蒙特卡洛的仿真结果,导致传输距离相同时,云雾对0.86μm波长激光透过率的单次散射近似结果小于蒙特卡洛的仿真结果;同一能见度下谱分布参量不同的三种云雾,消光特性的差别较小,云雾粒子尺度分布对消光特性的影响不明显.
The absorption and scattering effects of atmospheric molecules and cloud particles on incident laser were studied. The extinction characteristics of three kinds of cloud with different spectral distribution on 0.86μm wavelength laser were calculated by Kruse model, single-scattering approximation and Monte-Carlo method. The results show that the Kruse model is no longer suitable for the calculation of cloud extinction coefficient when the visibility is less than 0.5km. When the visibility is the same, the single scattering approximate result of extinction coefficient is larger than the Monte Carlo simulation result, The results of single-scattering approximation of wavelength laser transmittance are less than those of Monte Carlo simulation. The three clouds with different spectral distributions have the same difference in extinction characteristics, but the cloud particle size distribution has no obvious effect on the extinction characteristics.