基于M^2因子测量的大气湍流参数的确定方法  

Method for determining the characteristic parameters of the turbulence based on the measurement of M^2-factor

作　　者：潘平平[1] 张彬[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《物理学报》2011年第1期317-323,共7页Acta Physica Sinica

基　　金：教育部新世纪优秀人才支持计划(批准号:NCET-05-0487)资助的课题~~

摘　　要：基于广义惠更斯-菲涅尔原理以及大气湍流理论,推导出部分相干光束在大气湍流中传输的光束传输M2因子的解析表达式.定量分析了表征大气湍流参数的折射率结构常数C2n和涡旋内尺度l0对M2因子的影响,并由此提出了一种通过实验测量大气湍流中光束的M2因子,进而确定出大气湍流参数的新方法.研究结果表明,由于大气湍流对相干性好的光束影响更为明显,在测量中可采用具有高相干性的基模高斯光束作为测量光源,而测量装置则可采用常规的M2因子测量仪.利用本文提出的方法,可简单、方便地对大气湍流参数进行确定.Based on the extended Huygens-Fresnel principle and theory for the turbulence,the analytical expression for the beam propagation factor （M2-factor） of partially coherent beams propagating in a turbulent atmosphere has been derived. The effects of the structure constant of the refractive index fluctuations C2n and the inner scale of the turbulence l0on the M2 factor have been analyzed quantitatively. Consequently,a new method for determining the characteristic parameters of the turbulence based on the measurement of the M2 factor by experiments has been proposed. The results show that the laser beams with better spatial coherence property are more sensitive to the effects of turbulence,so the fundamental Gaussian beams with fully coherence can be used as the source in the measurement,and the usual instruments for measuring the M2-factor can be adopted as the experiment equipments. It is very simple and convenient to determine the characteristic parameters of the turbulence by applying the method proposed in this paper.

关 键 词：光束传输M2因子 大气湍流参数 湍流折射率结构常数 湍流涡旋内尺度 

分 类 号：O436[机械工程—光学工程]