强激光与粒子束, 2004, 16 (7): 821, 网络出版: 2006-05-15   

激光大气闪烁的分形分析

Fractal characteristics of laser scintillation in the atmosphere
作者单位
中国科学院,安徽光学精密机械研究所,大气光学实验室,安徽,合肥,230031
摘要
采用分形理论分析了激光大气闪烁的统计特征.研究结果表明:在弱起伏条件下,激光大气闪烁的分形维和奇异性随光强起伏的增强而增大,而其长期相关性则减小;不同Fresnel尺度下具有相同闪烁指数的激光大气闪烁的分形特征存在着明显的差别;在强起伏条件下,有限的数据中尚未发现分形维有饱和现象,因此可以用来描述激光大气闪烁的强度.
Abstract
Laser scintillation in the turbulent atmosphere was analyzed using the fractal methods, especially its fractal dimension and Hurst exponent. The results show that: the laser scintillation is a nonstationary random process with long-run and positive correlation. In the weak fluctuation conditions (the scintillation index in the range of 0 to 1.2), the fractal dimension would increase and the Hurst exponent would decrease with the increase of the scintillation index. That means the scintillation's intensity and complexity both increase and the temporal correlation decreases as the degree of fluctuation increases. In the strong fluctuation conditions, the limited data may reflect that the fractal dimension keeps on increasing, and no saturation appears. In addition, the effect of the Fresnel zone to the scintillation was also studied in the paper and some new results is obtained.
参考文献

[1] Tatarskii.Wave propagation in the turbulent atmosphere[M].Beijing:Science Press,1978.

[2] Anthony Davis.Multifractal characterizations of intermittency in nonstationary geophysical signals and fields[A].Current Topics in Nonstationary Analysis[C].Singapore World-Scientific:1996.97-158.

[3] Mandelbrot B B.Fractal geometry of the nature[M].Shanghai:Far-east Press,1998.

[4] 饶瑞中.湍流大气中的准直激光束:分形结构与相位不连续点[J].强激光与粒子束,2002,14(4):501-504.
Rao R Z.The collimated laser beam in the turbulent atmosphere:fractal structure and phase branch.High Power Laser and Particle Beams,2002,14(4):501-504.

[5] Hurst H E.Methods of using long-term storage in reservoirs[A].Proc of the Institution of Civil Engineers Part I[C].1955.519-577.

[6] Mandelbrot B B.Long-run linearity,locally Gaussian process,H-spectra and infinite variance[J].International Economic Review,1969,10:82-111.

[7] Falconer K J.Fractal geometry:mathematical foundation and application[M].Shenyang:North-east University Press,1990.340-353

[8] 饶瑞中,王世鹏,刘晓春,等.激光大气闪烁的间歇特征[J].强激光与粒子束,1999,11(2):185-188.
Rao R Z,Wang S P,Liu X C,et al.Intermittency characteristics of laser irradiance scintillation in atmosphere.High Power Laser and Particle Beams,1999,11(2):185-188.

朱文越, 饶瑞中, 梅海平. 激光大气闪烁的分形分析[J]. 强激光与粒子束, 2004, 16(7): 821. ZHU Wen-yue, RAO Rui-zhong, MEI Hai-ping. Fractal characteristics of laser scintillation in the atmosphere[J]. High Power Laser and Particle Beams, 2004, 16(7): 821.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!