大气能见度对光偏振特性的影响

Influence of atmospheric visibility on polarization property of light

通过建立大气能见度和传输介质参数之间的数学模型,用光学厚度表征大气能见度,分析了大气能见度对传输光偏振特性的影响。利用偏振蒙特-卡罗(Monte Carlo)方法仿真了散射光在不同光学厚度下偏振信息的变化,并在偏振光学模拟实验舱中模拟多种大气能见度环境进行实验。通过仿真与实测实验数据对比分析,研究了大气能见度对光偏振特性的影响。结果表明:偏振光随着大气能见度的减小,即光学厚度的增大,偏振度出现消偏,偏振角分布特征逐渐模糊,整体轮廓向外扩散,偏振度均值呈下降趋势,并且随着能见度的进一步减小,粒子散射次数逐渐达到饱和,偏振度下降幅度逐渐变缓。

By establishing mathematical model between atmospheric visibility and transmission medium parameters,atmospheric visibility is characterized by optical thickness,and influence of atmospheric visibility on polarization characteristics of transmission light is analyzed. The Monte Carlo method is used to simulate the variation of polarization information of scattered light at different optical thicknesses,and simulate several atmospheric visibility environment in polarization optical simulation experiment module. Contrastive analysis on simulation experiments and experimental data,influence of atmospheric visibility on polarization characteristics of light is studied. The results show that polarization of polarized light decreases with decrease of atmospheric visibility,that is,the increase of optical thickness,the polarization degree is depolarized,characteristics of polarization angle distribution is gradually blurred,the overall contour is diffused outward,the mean value of the polarization decreases,with further reducing of visibility number of particles scattered are gradually saturated,degree of decline in degree of polarization gradually slow down.