基于相干长度测量的水平方向大气湍流特性验证分析
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摘要
大气折射率结构常数C_n~2是表示大气光学湍流强度的重要参数。利用大气相干长度测量仪测量了某地区冬季水平路径的大气相干长度,并在弱起伏条件近似下,考虑路径上的平均湍流效应,推导了大气相干长度与折射率结构常数的关系式,通过实验数据统计分析,得出了某地区冬季水平大气折射率结构常数C_n~2的分布廓线和日变化特性,对某地区的大气湍流结构特性有了比较清晰的认识,并通过统计结果找到了适于激光传输工作开展的最佳时间窗口。
The atmospheric structure constant of refractive index C_n~2 is an important parameter of atmospheric optical turbulence intensity. The atmospheric coherence length of the winter horizontal path in some region is measured using the atmospheric coherence meter. In the case of approximate weak fluctuation condition, considered the average turbulence effect on the path, the relation formula between the atmospheric coherence length and C_n~2 is deduced. The profile and daily variation characteristics of C_n~2 are obtained by statistical analyzing for experimental data of winter horizontal in the region, and structure characteristics of atmospheric turbulence in the region are known clearly. The best time window for laser transmission is found by statistical results.
The atmospheric structure constant of refractive index C_n~2 is an important parameter of atmospheric optical turbulence intensity. The atmospheric coherence length of the winter horizontal path in some region is measured using the atmospheric coherence meter. In the case of approximate weak fluctuation condition, considered the average turbulence effect on the path, the relation formula between the atmospheric coherence length and C_n~2 is deduced. The profile and daily variation characteristics of C_n~2 are obtained by statistical analyzing for experimental data of winter horizontal in the region, and structure characteristics of atmospheric turbulence in the region are known clearly. The best time window for laser transmission is found by statistical results.
引文
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[4]吴晓庆,方强,饶瑞中,等.近海边高空光学湍流的探空测量与模式比较[J].强激光与粒子束,2006,18(10):1605-1609.
[5] Tatarskii V I. Effects of the turbulent atmosphere on wave propagation[M]. Trans by Wen Jingsong. Beijing:Science Press,1978(in Chinese).
[6]吴晓庆,饶瑞中.湿度起伏对可见光波段折射率结构常数的影响[J].光学学报,2004,24(12):1559-1602.
[7]袁仁民,曾宗泳,肖黎明,等.不同方法测量折射率结构常数的比较[J].光学学报,2000:755-756.
[8]孙刚,翁宁泉,肖黎明,等.大气温度分布特性及对折射率结构常数的影响[J].光学学报,2004,24(5):592-596.
[9]汪建业,刘晓春,饶瑞中,等.大气相干长度的昼夜观察[J].强激光与粒子束,2004,16(1):3-4.