大气偏振度与PM2.5粒子浓度特性研究

为了满足偏振光导航在雾霾天的应用需求。研究雾霾天对于偏振信息检测的影响及其规律,对降低自然扰动对偏振光导航系统的误差、优化系统具有重要的意义。本文采用全天域偏振成像法对雾霾天的偏振信息进行大量的实验采集,并通过国家气象中心查询大气PM2.5粒子浓度,对两者的关系进行理论与实验分析。结果表明,PM2.5浓度与大气偏振度的关系随着PM2.5粒子浓度的升高而降低,两者呈类指数关系。通过基于米氏散射理论对单粒子多次散射进行分析,结合大气的特殊情况,在将PM2.5粒子近似为球形结构进行通过米氏散射进行理论分析,分析结果与实验结果基本一致。通过对误差进行残差分析和残差平方和分析,误差主要来源于大气复杂情况的干扰以及本实验所用探测器CMOS传感器的线性范围。本文通过大量的实验所研究的特性曲线可以反映特殊天气下偏振信息的基本特征,对以后在特殊天气情况下的基于偏振光导航设计具有重要的意义。

Research on the characteristics of atmospheric polarization and PM2.5 particle concentration

In order to meet the application requirements of polarized light navigation in fog and haze days. Find the relationship between the PM2.5 concentration and the degree of atmospheric polarization, the research of the pattern is very important to reduce the polarization navigation error caused by natural disturbance. This paper uses the experiment full-sky polarization imaging on the polarization information collecting a large number of haze days. This paper use full-sky polarization imaging acquisition information in haze days and through the National Meteorological Center to check the atmospheric PM2.5 particle concentration. Theoretical and experimental analysis on the relationship between PM2.5 and DOP. Results shows: the relationship between the concentration of PM2.5 and the degree of atmospheric polarization decreases with the increase of the concentration of PM2.5 particles, which is a kind of exponential relationship. By the Mie scattering theory of single scattering analysis based on the special circumstances of the atmosphere, in the spherical structure through theoretical analysis of Mie scattering approximation of PM2.5 particles, the analysis results are consistent with the experimental results. By means of error analysis and residual error analysis, the error is mainly caused by the interference of atmospheric complex conditions and the linear range of the detector CMOS sensor used in this experiment. In this paper, the characteristic curve of a large number of experiments can reflect the basic characteristics of polarization information in special weather, which is of great significance to the design of polarization based navigation in special weather conditions.