天文高分辨像复原技术检测地基天文光学望远镜成像质量

在天文高分辨像复原技术的基础上，根据谱比法较准确地测量视宁度参数r0后，计算得到大气系统的平均短曝光传递函数，从而把大气湍流对检测结果的影响从综合成像系统中分离了出来。利用望远镜摄取大量目标源的短曝光像(斑点图)作为原始数据，通过分析这些含有望远镜衍射极限分辨率信息的斑点图，实现天文光学望远镜系统点扩展函数(PSF)中低频信息的重建，得到半峰全宽(FWHM)和80％的能量集中度(EE)。

High-Resolution Image Reconstruction Technology Applied to the Optical Testing of Ground-Based Astronomical Telescopes

On the foundation of high-resolution image reconstruction technology,we bring forward a new way to test the imaging quality of the ground-based large aperture optical telescopes.After eliminating the effects of atmosphere turbulence,we can get the full width at half maximum(FWHM)and the encircled energy (EE).In this article,firstly we explain the basic principle,then we present the steps and results for our experiment,finally give a comparative result with other testing methods.In this new testing,a point source is used as the testing source.A number of short-exposure images of the observed star is our working data which include the diffraction-limited information of the telescopes,then the reconstruction of the telescope Point Spread Function (PSF) can be realized.In the second section,the important effects of the atmosphere seeing and the principle of spectra-ratio method for measuring seeing are explained.In the third section,we analyze the relationship among the OTF of the three systems,i.e. the atmosphere-telescope system,the atmosphere system and the telescope system.In fourth section,we show the theory of our new testing way which based on the averaged short-exposure transfer function.Finally the presented conteuts are our experiment using the method for testing the 1m telescope of Yunnan Observatory and a comparative result with a traditional way.It is shown that the two ways have the similar accuracy.