Experimental investigation of the outer scale in atmospheric optical turbulence near the ground

doi:10.7498/aps.64.224216

	Experimental investigation of the outer scale in atmospheric optical turbulence near the ground
	Wang Qian 1,2; Mei Hai-Ping1 ; Qian Xian-Mei1 ; Rao Rui-Zhong1
	2015-11-20
发表期刊	ACTA PHYSICA SINICA
摘要	In this article, the Von-Karman model of turbulence spatial correlation function which contains the parameter of outer scale is analyzed. Then, the experimental data of air refractive index variation obtained from a high quality fiber optical turbulence sensing array are used to evaluate the outer scale of atmospheric optical turbulence as well as its diurnal variation through the algorithm of nonlinear fitting. The results validate the suitability of the Von-Karman model. By combining the theory of correlation function with the spatially distributed and simultaneously measured data, three kinds of turbulence spatial scales described by correlation function are revealed as clearly as possible. Results show that the values of outer scale in atmospheric optical turbulence 1.8 m above the grassland tend to be larger in the daytime and smaller in the night. The mean value around noon is 0.44 m, while in the night it becomes 0.3 m. Here, three of the important views should be noted. Firstly, when the displacement of two points is just equal to the outer scale, their correlation coefficient is 0.26, and when it exceeds the outer scale, there is still a certain value of correlation coefficient. Secondly, the integral scale represents the averaged value of scale in the vortex of optical turbulence. And, it is slightly smaller than the outer scale. Thirdly, when the distance of two points equals the biggest scale of vortex in optical turbulence, the correlation coefficient tends to zero, and the value of biggest scale is slightly bigger than the outer scale. It is easy to find that the diurnal variation tendencies of the three spatial scales are similar to that of intensity in optical turbulence. The method of obtaining the characteristic scales by spatially arranged and simultaneously measured optical turbulence is direct, and the results can be considered as the evidence to prove the models of correlation function including the Von-Karman model. So, it promotes the research on the property of spatial structure to a certain extent.
文章类型	Article
关键词	Atmospheric Optical Turbulence Spatial Correlation Function Outer Scale
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.7498/aps.64.224216
关键词[WOS]	INDEX
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010) ; National Natural Science Foundation of China(41205010)
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000368824600025
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/22267
专题	中科院安徽光学精密机械研究所
作者单位	1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Atmospher Composit & Opt Radiat, Hefei 230031, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中科院安徽光学精密机械研究所
推荐引用方式 GB/T 7714	Wang Qian,Mei Hai-Ping,Qian Xian-Mei,et al. Experimental investigation of the outer scale in atmospheric optical turbulence near the ground[J]. ACTA PHYSICA SINICA,2015,64(22):1-7.
APA	Wang Qian,Mei Hai-Ping,Qian Xian-Mei,&Rao Rui-Zhong.(2015).Experimental investigation of the outer scale in atmospheric optical turbulence near the ground.ACTA PHYSICA SINICA,64(22),1-7.
MLA	Wang Qian,et al."Experimental investigation of the outer scale in atmospheric optical turbulence near the ground".ACTA PHYSICA SINICA 64.22(2015):1-7.

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