光学学报, 2016, 36 (7): 0729001, 网络出版: 2016-07-08   

烟雾浓度对偏振光传输特性的影响 下载: 503次

Influence of Smoke Concentration on Transmission Characteristics of Polarized Light
作者单位
1 长春理工大学空地激光通信技术国防重点学科实验室, 吉林 长春130022
2 长春理工大学电子信息工程学院, 吉林 长春 130022
摘要
针对烟雾环境中烟雾浓度对偏振光传输特性的影响问题,采用烟煤粒子作为研究对象,分别研究了水平、垂直、+45°方向线偏振光及左旋、右旋圆偏振光经不同浓度介质传输后偏振度(DOP)的变化情况。采用蒙特卡罗方法建立仿真模型并对偏振传输理论进行分析。根据实测中浓度条件的不可控因素,采用光学厚度表征浓度,从仿真与室内实验两方面验证浓度对偏振光传输特性的影响。结果表明,偏振光入射时,偏振度随介质浓度的增加不断下降;水平、垂直、+45°线偏振光入射时,不同线偏振光偏振度随浓度的变化趋势大致相同;圆偏振光入射时,左旋、右旋圆偏振光的变化趋势基本一致;介质浓度较低时,圆偏振光偏振度随浓度的变化与线偏振光大致相同,而介质浓度较高时,圆偏振光的偏振度始终大于线偏振光,表明圆偏振光在高介质浓度、低能见度条件下具有更好的保偏能力。
Abstract
To investigate the influence of smoke concentration on the transmission characteristics of polarized light in the smoke environment, carbonaceous particles are used as the research object to study the variation in the degree of polarization (DOP) of linear polarized light in the horizontal, vertical, +45° directions, and right- and left-hand circular polarized light after transmission in different medium concentrations. The Monte Carlo method is used to build a simulation model and analyze the polarization transmission theory. According to the uncontrollable factors for the concentration in actual measurement, the optical depth is applied as the description of the concentration, and the influence of concentration on the transmission characteristics of polarized light is verified by the simulation and the experiment. The results show that DOP of the incident polarized light decreases gradually with the increasing medium concentration. When the linear polarized light in horizontal, vertical and +45° directions is incident, the DOP variation tendency with the concentration is nearly the same as each other. DOP variation trend for the right- and left-hand circular polarized light basically coincides. DOP of the circular polarized light is close to that of the linear polarized light at low medium concentration, and is always higher than the latter at high medium concentration, which demonstrates better polarization-maintaining ability of circular polarized light under low visibility and high medium concentration.

张肃, 战俊彤, 白思克, 付强, 段锦, 姜会林. 烟雾浓度对偏振光传输特性的影响[J]. 光学学报, 2016, 36(7): 0729001. Zhang Su, Zhan Juntong, Bai Sike, Fu Qiang, Duan Jin, Jiang Huilin. Influence of Smoke Concentration on Transmission Characteristics of Polarized Light[J]. Acta Optica Sinica, 2016, 36(7): 0729001.

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