静态像差对交叉谱相位复原精度的影响及补偿方法  

Influence of Static Aberrations on the Accuracy of Cross Spectrum Phase Reconstruction and the Compensated Method

作　　者：钟立波 田雨[1,2] 饶长辉[1,2] 

机构地区：[1]中国科学院光电技术研究所,四川成都610209 [2]中国科学院自适应光学重点实验室,四川成都610209 [3]中国科学院大学,北京100049

出　　处：《光学学报》2014年第7期12-19,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11178004)

摘　　要：斑点图像重建方法可以有效抑制大气湍流的影响,得到目标衍射极限像。然而系统静态像差破坏了波前的统计信息,降低了相位重建精度。通过理论分析得出在理想情况下,离焦、像散、彗差和球差中只有彗差会在重建结果中引入额外相位值。进一步采用分割光瞳的方式表示交叉谱传递函数与静态像差的关系时,指出通过选择交叉谱的平移向量方向,可以实现在特定方向上静态像差之间的平衡,降低系统像差对相位重建的影响。仿真中球差与离焦像差之间的平衡及离焦像差与像散之间的平衡,都起到了降低相位重建误差的效果。Speckle image reconstruction can effectively remove the influence of the atmospheric turbulence and obtain the diffraction limited images of the object. However, the static aberrations of the system can destroy the statistical information of the wavefronts and decrease the accuracy of the Fourier phase reconstruction. It shows that among defocus, astigmatism, coma and spherical aberration, only coma has residual phase on the reconstruction in ideal case. By dividing the pupil into several sub-apertures with Fried parameter as the diameter, the influence of the static aberration on the phases of the cross spectrum transfer function is analyzed. The result shows that by choosing the direction of the shift frequency in the cross spectrum transfer function, aberration balancing can be used to reduce the influence of the static aberration and improve the accuracy of the reconstruction. The simulations show desired effects of the balancing on the spherical aberration and defocus, astigraatism and defocus.

关 键 词：大气光学 图像处理 静态像差 斑点干涉 

分 类 号：O438[机械工程—光学工程]