折迭式湍流大气路径中双频光束协方差  

COVARIANCE OF BIFREQUENCY BEAM PROPAGATING IN A FOLDED TURBULENT ATMOSPHERIC PATH

作　　者：宋正方[1] 马骏[2] 刘晓春[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学院物理研究所

出　　处：《红外研究》1990年第4期269-276,共8页

摘　　要：讨论了双频光束在用平面镜反射的折选式湍流大气路径中传播时的相关性质,利用Kolmogorov湍流模型导出了相关系数的理论表达式,证明这种光路中双频光束所用的两个波长相差越大,其相关性越差;同直接光路相比,在菲涅尔数较小时,折迭光路上的相关系数较大;而在菲涅尔数较大时,则相反。孔径平滑因子也具有类似的性质。Correlation of bifrequenoy beam propagating in a folded turbulent atmospherio path deflected from a plane mirror is diseussed in this paper. Using Kolmogorov's turbulence model, a theoretic expression of correlation coefficient is derived. It is shown that the farther the difference between two wavelengths of the beam, the worse the correlation is. The correlation coefficient for folded path is larger than that for direct path as the Fresnel parameter is less than a certain number and vice versa. The same behavior exists for the aperture averaging factor.

关 键 词：湍流 大气 双频光束 协方差 波 

分 类 号：O435.1[机械工程—光学工程]