基于正态对数谱的1.06μm激光大气散射特性研究

Research on 1.06 μm Laser Atmosphere Scattering Characteristics Based on Normal Logarithm Distribution

针对当前在大气散射计算中,广泛采用Junge谱带来的对近地面气溶胶粒子分布估计不准确的问题,采用对近地面气溶胶粒子分布描述较好的正态对数谱,建立大气激光散射模型,对1.06μm激光的大气散射的空间和时间特性进行仿真分析。结果表明,散射强度随离轴距离的增加,呈先快速减弱,再缓慢减弱的趋势;在离轴位置上,探测光强主要来自距探测点较近的位置;探测光信号峰值随离轴距离的增加逐渐后移,而且脉宽逐渐增加。

To solve the problem that the Junge distribution widely used in atmosphere scattering calculation makes the estimation of aerosol particles distribution inaccurate near the ground,the normal logarithm distribution which can accurately describe the aerosol particles distribution near the ground is adopted.And a laser atmosphere scattering model is established to simulate and analyze the space and time characteristics of1.06μm laser atmosphere scattering.Results show that the scattering intensity has a trend of sharply decreasing then slowly decreasing with the increasing of off-axis distance.The detection scattering intensity mainly comes from the position near the detection point on off-axis.The peak of the detection scattering pulse has a backward movement with the increasing of off-axis distance and pulse width increases gradually.