基于等效介电常数的激光雾中衰减研究

摘要

As the medium with absorption and scattering properties,sea fog has strong attenuation effect on the laser. Combined with the physical characteristics of sea fog,the general calculating model of sea fog equivalent permittivity is derived according to the theory of dielectric polarization.Furthermore,the calculating model of attenuation rate is also obtained when laser is propagated through fog.As an example of experiential droplet spectrum of advection fog and droplet distribution of two sea fog cases,the attenuation model of equivalent permittivity is calculated and simulated, and the impact of sea fog physical characteristics on laser transmission effect is analyzed and evaluated.The results show that the impact of sea fog physical characteristics is incarnated in the model based on equivalent permittivity, which is obviously effected by sea fog characteristics such as visibility and droplet distribution.%海雾是一种具有吸收和散射特性的介质，对激光有较强的衰减作用。结合海雾环境的物理特征，根据电介质极化理论推导出了海雾介质等效介电常数的一般计算模型，并进一步得到激光雾中传输衰减率计算模型。以平流雾的经验雾滴谱和两次海雾个例雾滴谱为例对介电常数衰减模型进行了计算和仿真，并分析和评估了海雾环境物理特征对激光传输效应的影响。结果表明，基于等效介电常数的激光雾中衰减计算模型体现了海雾物理特性的影响，特别是能见度、雾滴谱分布等对其作用明显。