中文摘要：

利用Mie散射理论,通过数值计算得到了1.06μm激光在低空大气中传输时的散射特性;不同尺度参数的粒子的散射光强分布相差极大,随着尺度参数的增加,散射光强越来越集中于前向;复折射率的变化对散射光强影响不大。通过对大气散射的辐照度理论分析和数值计算,得到大气散射的辐照度随离轴距离的增大而近似按反比规律下降的特征;同时,对不同能见度下的散射辐照度进行了数值计算,能见度的不同只影响散射强度的大小,而不影响散射强度的分布。不同散射点的散射光到达探测器所需的时间不同,延迟时间与离轴垂直距离和探测角呈简单的线性关系,这些特征为激光散射离轴探测提供了理论依据和参考。

英文摘要：

The properties of the scattering of 1.06 μm laser in the low atmosphere was calculated by using Mie scattering theory.The distributions of scattering light were different due to different scale parameter of micro particles.The energy of scattering light distributes in the forward area along the increase of scale parameter.The variety of the relative index has little effect on the distribution of scattering light.The feature that the maximum intensity of aerial scattering laser decreased slowly with the off-axial distance was obtained by analyzing and calculating scattering irradiance distribution.The feature that scattering irradiance distribution only affected scattering intensity but not the distribution of scattering intensity was obtained by calculating scattering irradiance distribution on the conditions of different visibilities.The pulse arrived at the detector in different time,the delayed time was linear to the off-axis distance and detecting angle.The characteristics can provide theoretical basis and reference for off-axis detection of laser scattering.