多层湍流大气相位屏的数值模拟  

Simulation of Random Phase Screens Formed by Multiple Layers of Atmospheric Turbulence

作　　者：付玉[1] 金振宇[1] 

机构地区：[1]中国科学院国家天文台/云南天文台,云南昆明650011

出　　处：《天文研究与技术》2010年第1期47-54,共8页Astronomical Research & Technology

基　　金：国家自然科学基金(10778636)资助

摘　　要：高分辨图像重建技术可以有效消除湍流大气的影响,重建目标的接近望远镜衍射极限的图像。但是当目标的视场角比较大时,大气—望远镜综合系统不再是线性空不变的,给图像重建带来新的困难,它是大气性质中的一个重要特性,对大气相位屏的模拟应该满足这一特性。提出了一种可以模拟等晕区效应的多层大气相位屏的数值模拟方法,这种方法可以应用于等晕区对高分辨统计重建方法的影响的研究中。利用该数值模拟方法模拟了5″和8″的双星的斑点图,用斑点干涉术对模拟的双星进行了重建,并与实测的双星的斑点干涉术重建结果进行了比较。比较结果表明该数值模拟方法所产生的等晕区效应与实际的等晕区效应相似。The High-Resolution Image Reconstruction method can diminish effects from turbulent atmosphere and reconstruct the image of object to approach the diffraction limit of the used telescope. However, due to the effect on the isoplanatic patch, when the field of the view about the object is large, a complete diffraction-limited image cannot be reconstructed. A numerical simulation method is proposed here by modeling multiple atmospheric phase screens to take into account the effect on the isoplanatic patch. This method should be applicable to the study of the effect on the isplanatic patch in the high-resolution statistical reconstruction. With this simulation method the speckle images of binary-star systems with separations of 5 and 8 arcseconds are respectively modeled. The reconstructed images for the simulations and real binary-star observations are compared. The results show that the effect modeled by the simulation method is similar to the actual.

关 键 词：大气光学 湍流大气 等晕区 数值模拟 

分 类 号：P427.1[天文地球—大气科学及气象学]