光学学报, 2020, 40 (13): 1329002, 网络出版: 2020-07-09
火星沙尘环境中的偏振光传输特性仿真 下载: 888次
Simulation of Polarized Light Transmission Characteristics in Martian Dust Environment
摘要
对偏振光在火星沙尘中的传输特性进行了研究,首先分析了火星沙尘粒子散射系数、吸收系数和不对称因子随粒径尺寸的变化关系,然后利用偏振蒙特卡罗方法模拟了偏振光在火星大气中的多重散射,计算并分析了波长、粒径分布、风速、高度、粒子数浓度对偏振光传输特性的影响。研究结果表明:偏振光退偏度随着传输距离的增大而增大,粒子数浓度越大,偏振度退化越严重。当波长为0。55 μm时,对于所选用的两组粒径分布,有效粒径小时反而退偏严重, 15。3 m/s和1。7 m/s风速对应的退偏度相差将近两个数量级,在所选的6个波长中7。46 μm激光在火星沙尘中传输时偏振保持性最好,而波长0。66 μm激光在火星沙尘中传输时透射性是最好的。
Abstract
In this paper, the transmission characteristics of polarized light in Martian dust are investigated. First, the relationship among the particle scattering coefficient, absorption coefficient, asymmetry factor, and particle size of Martian dust is analyzed. Then, the multiple scattering of polarized light in the Martian atmosphere is simulated using polarized Monte Carlo method. The effects of wavelength, particle size distribution, wind speed, height, and particle number concentration on the transmission characteristics of polarized light are calculated and analyzed. The results show that the degree of depolarization of polarized light increases with the increasing transmission distance, and the greater the particle number concentration, the more severe the depolarization degree. When the wavelength is 0.55 m, the depolarization of the selected two groups of particle size distribution is serious for the small effective particle size, and the depolarization difference corresponding to the wind speeds of 15.3 m/s and 1.7 m/s is nearly two orders of magnitude. The polarization retention of 7.46 μm laser is the best in the six selected wavelengths, and the 0.66 μm laser has the highest transmittance in the Martian dust.
杨玉峰, 韩安丽, 雷思辰. 火星沙尘环境中的偏振光传输特性仿真[J]. 光学学报, 2020, 40(13): 1329002. Yufeng Yang, Anli Han, Sichen Lei. Simulation of Polarized Light Transmission Characteristics in Martian Dust Environment[J]. Acta Optica Sinica, 2020, 40(13): 1329002.