摘要
利用光学成像仪器进行水下资源勘测时,成像质量常因水中气泡干扰而降低。研究水中气泡环境辐射传输特性并分析其对光学仪器成像的干扰,对提升水下成像抗干扰能力具有重要指导意义。首先构建水中单气泡成像环境,模拟光在单气泡传输过程中辐射强度和偏振状态的变化趋势,得出单气泡界面处的传输相位函数;在此基础上,通过增加气泡数量,模拟水中多气泡成像环境下光的辐射强度和偏振状态随气泡分布的变化情况;最后基于几何光学近似理论进行蒙特卡洛模拟,仿真并得出不同气泡半径大小、不同光线传输路径尺度对光线在气泡群中前向和后向传输的影响。气泡理论分析、仿真计算和实测实验表明:光在气泡界面处产生的偏振态变化与观测几何具有强关联,当入射角较小时,光的穿透性较强,辐射强度衰减缓慢;随着传输距离路径增加,前向传输和后向传输的偏振度呈现相反的变化趋势;理论、仿真和实验结果三者基本保持一致。该研究可以为水下复杂环境目标偏振成像领域提供一定的参考。
Using optical imaging equipment for survey of underwater resources often obtains lower quality of image because of underwater bubble’s interference.Taking analysis of radiation transmission characteristics of bubble and interference characteristics on the optical imaging instrument in the water environment has important guiding significance for improving anti-jamming capability of underwater imaging.At first,the single bubble underwater imaging environment is built and the changing trends of radiation intensity and polarization state for light transmitting in single bubble are simulated,and the transmission phase function on the interface of single bubble is obtained.Then,the changing trends of radiation intensity and polarization state of light with bubble distribution under multi-bubble imaging environment are simulated when increasing the number of bubbles on the basis of research on single bubble.Finally,the effects on forward transmission and backward transmission characteristics with different radius of bubble sizes and different distances of light transmission are simulated with Monte Carlo method based on theory of geometrical optics approximation.The study of bubble theory,simulation and experiment shows that the changing trend of produced light’s polarization at surface of bubble has strong correlation with observation geometry,when the angle of incidence is small,light has strong penetrability and the attenuation of radiation intensity is slow.The degrees of polarization of forward transmission and backward transmission show significantly opposite trend with increase of transmission distance.The theory,simulation and experimental results are basically consistent.The research can provide a certain reference value in target polarization imaging field under complex underwater environment.
作者
宋强
孙晓兵
刘晓
提汝芳
黄红莲
Song Qiang;Sun Xiaobing;Liu Xiao;Ti Rufang;Huang Honglian(Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;University of Science and Technology of China,Hefei 230026,Anhui,China;Key Laboratory of Optical Calibration and Characterization,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Hefei Chief Expert Studio of Agricultural Industry,Hefei 230031,Anhui,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第12期118-129,共12页
Acta Optica Sinica
基金
国家重点研发计划(2016YFE0201400)
中国科学院合肥研究院重点项目(Y73H9P1801)。
关键词
几何光学
单气泡
多气泡
蒙特卡洛
偏振度
geometrical optics
single bubble
bubble group
Monte Carlo
degree of polarization
