降雨环境中激光偏振传输特性仿真方法  

Simulation method for laser polarization transmission characteristics in rainfall environment

作　　者：朱嘉悦 方明[2] 蔡雅新 付强[3] 宋延嵩[3] ZHU Jiayue;FANG Ming;CAI Yaxin;FU Qiang;SONG Yansong(School of Computer Science and Technology,Changchun University of Science and Technology,Changchun 130022,China;School of Artificial Intelligence,Changchun University of Science and Technology,Changchun 130022,China;National Defense Key Laboratory of Air-Ground Laser Communication Technology,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学计算机科学技术学院,吉林长春130022 [2]长春理工大学人工智能学院,吉林长春130022 [3]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

出　　处：《应用光学》2025年第1期210-216,共7页Journal of Applied Optics

基　　金：国家自然科学基金(U2141231);光电信息控制和安全技术重点实验室(2021JCJQLB055011)。

摘　　要：偏振光在近地大气降雨环境中传输时,易被雨滴吸收和散射,产生严重衰减,进而影响光学系统的目标探测能力。研究不同降雨条件下的偏振光传输特性,为偏振探测在目标探测系统中克服降雨因素的影响提供了一定依据。使用韦布尔雨滴谱表征雨滴的尺寸分布,基于米氏散射理论计算雨滴粒子的散射特性,采用蒙特卡洛方法模拟偏振光透过雨滴粒子进行多次散射后的偏振特性,进而研究降雨环境下不同波长、偏振态、降雨量以及传输距离对偏振传输特性的影响。仿真结果表明:4种偏振光的偏振度同降雨量的增加表现出减少的趋势,并且传输距离也有相同的趋势表现,当降雨量较小时,圆偏振光和线偏振光的偏振度随降雨量的变化趋势一致;而降雨量较大时,圆偏振光较线偏振光受到的影响较小,表现出更好的保偏能力,且波长越大,圆偏振光的保偏能力越强。Polarized light is easily absorbed and scattered by raindrops when it is transmitted in a rainfall environment near the ground,resulting in severe attenuation and affecting the target detection ability of the optical system.The transmission characteristics of polarized light under different rainfall conditions were studied to provide a certain basis for polarization detection to overcome the influence of rainfall factors in target detection systems.The Weibull raindrop spectrum was used to characterize the size distribution of raindrops,and the Mie scattering theory was utilized to compute raindrop particle scattering characteristics.The Monte Carlo method was employed to simulate the polarization properties of polarized light after multiple scattering by raindrop particles.Furthermore,the impact of different wavelengths,polarization states,rainfall,and transmission distances on polarization transmission characteristics in rainfall environment was studied.The simulation results show that the polarization degree of the four types of polarized light decreases as rainfall increases,and the transmission distance follows a similar pattern.Under low rainfall conditions,the polarization degree of circularly polarized light exhibits a similar trend to linearly polarized light.However,under high rainfall conditions,circularly polarized light is less susceptible to change compared to linearly polarized light,demonstrating superior polarization retention properties.Furthermore,it is observed that the polarization retention ability of circularly polarized light strengthens with larger wavelengths.

关 键 词：散射 偏振光 雨滴尺寸 蒙特卡洛 传输特性 

分 类 号：TN241[电子电信—物理电子学] O436.3[机械工程—光学工程]