| 根据到达角协方差测量大气湍流外尺度 |
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| 引用本文： | 黄宏华,姚永帮,饶瑞中.根据到达角协方差测量大气湍流外尺度[J].光学学报,2007,27(8):1361-1365. |
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| 作者姓名： | 黄宏华 姚永帮 饶瑞中 |
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| 作者单位： | 中国科学院安徽光学精密机械研究所大气光学中心,合肥,230031 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 通过湍流大气中光波相位结构函数得到两点间的到达角协方差与大气湍流外尺度的关系,并利用差分到达角方差进行了归一化,进而得到大气湍流外尺度和差分到达角方差及到达角协方差的表达式。采用四孔到达角起伏测量仪进行了近地面水平路径的实验,测量结果表明在离地面6 m的高度上,湍流外尺度在4 m左右,并随时间变化,不同方向的测量结果有一些差别。
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| 关 键 词： | 大气光学 大气湍流外尺度 相位结构函数 到达角协方差 |
| 文章编号： | 0253-2239（2007）08-1361-5 |
| 收稿时间： | 2006/10/30 |
| 修稿时间： | 2006-10-30 |
Atmospheric Turbulence Outer Scale Measurement Based on Angle-of-Arrival Covariance |
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| Huang Honghua,Yao Yongbang,Rao Ruizhong.Atmospheric Turbulence Outer Scale Measurement Based on Angle-of-Arrival Covariance[J].Acta Optica Sinica,2007,27(8):1361-1365. |
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| Authors: | Huang Honghua Yao Yongbang Rao Ruizhong |
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| Institution: | Center for Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Hefei 230031 |
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| Abstract: | According to atmospheric turbulence phase structure function,the relation between the angle-of-arrival covariance of two points and the atmospheric turbulence outer scale is deduced,and normalized by the differential angle-of-arrival variance.The expression of outer scale by the ratio of angle-of-arrival variance and angle-of-arrival covariance is obtained.The experimental results for horizontal propagation in the real atmosphere by four-aperture angle-of-arrival variance measuring apparatus show that the average outer scale is about 4 m at the height of 6 m above the ground.Further more the outer scale changes with time,and they are different in different directions. |
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| Keywords: | atmospheric optics atmospheric turbulence outer scale phase structure function angle of arrival covariance |
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