基于MAD光流计算近地面大气光学湍流参数  

Calculation of Near-Surface Atmospheric Optical Turbulence Parameter Based on MAD Optical Flow

作　　者：郭一鸣 吴晓庆 青春 刘庆 王志远 杨期科 胡晓丹 Guo Yiming;Wu Xiaoqing;Qing Chun;Liu Qing;Wang Zhiyuan;Yang Qike;Hu Xiaodan(Key Laboratory of Atmospheric Optics,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;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,Anhui,China)

机构地区：[1]中国科学院合肥物质科学研究院安徽光学精密机械研究所大气光学重点实验室,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]先进激光技术安徽省实验室,安徽合肥230037

出　　处：《光学学报》2022年第24期45-54,共10页Acta Optica Sinica

基　　金：国家自然科学基金(91752103);先进激光技术安徽省实验室基金青年项目(AHL2021QN02)。

摘　　要：提出一种基于绝对中位值偏差(MAD)的光流计算方法,并用于计算近地面大气湍流折射率结构常数Cn2。通过光流计算捕捉望远镜系统拍摄的前后多帧目标图像的抖动信息,得到传输路径上的到达角起伏方差均值,从而估算近地面大气湍流折射率结构常数。通过在合肥市进行了为期6天的观测实验,将模型估计的Cn2均值与观测路径上温度脉动仪的实测结果进行充分对比,最终得到估算值与实测值的平均偏差(BIAS)、方均根误差(RMSE)、相关系数分别为0.0004、0.2708、0.7930,充分证明所提方法可以有效估算近地面大气湍流折射率结构常数,为基于图像反演大气湍流参数提供参考。An optical flow calculation method is proposed based on median absolute deviation(MAD)to estimate the refractive index structure constant of near-surface atmospheric turbulence,namely,Cn2.Specifically,this paper captures the jitter information of adjacent target images with multiple frames shot by a telescopic system through optical flow calculation and obtains the mean value of the angle-of-arrival fluctuation variance on the transmission path,so as to estimate the refractive index structure constant of near-surface atmospheric turbulence.Subsequently,a 6-day observation experiment is carried out in Hefei,and the mean value of Cn2 estimated by the model is comprehensively compared with the results measured by a micro-temperature sensor on the observation path.As a result,in terms of estimated and measured values,the mean deviation(BIAS),root-mean-square error(RMSE),and correlation coefficients are 0.0004,0.2708,and 0.7930,respectively.Therefore,it is fully proved that the proposed method can effectively estimate the refractive index structure constant of near-surface atmospheric turbulence and provide reference for the inversion of atmospheric turbulence parameters based on images.

关 键 词：大气光学 MAD光流计算 湍流 到达角起伏方差 大气湍流折射率结构常数 

分 类 号：O435.1[机械工程—光学工程] TP391.4[理学—光学]