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。
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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2007年第8期1361-1365,共5页
Acta Optica Sinica
基金
国家863计划激光技术领域资助课题
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
atmospheric optics
atmospheric turbulence outer scale
phase structure function
angle of arrival covariance
