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Alternative TitleA Focus Detection Method for Ground-Based Solar Telescope
方玉亮1,2; 柳光乾1; 金振宇1; 李鹏飞1,2; 刘忠1
Source Publication光学学报(Acta Optica Sinica)
Contribution Rank第1完成单位
Indexed ByEI ; CSCD ; 核心
Keyword地基太阳望远镜 焦点探测 能谱分析 大气湍流

太阳强热辐射导致太阳望远镜光机系统热形变,引发较明显的时变焦点位置漂移。离焦像差影响高分辨观测,降低观测图像的空间分辨率,因此需要探测并补偿望远镜的离焦像差。由于大气湍流的影响,一般的基于图像处理的焦点探测方法不能有效地运用于地基太阳望远镜。而天文望远镜常用的基于Shack-Hartman 波前探测的方法,在观测太阳边缘和低对比度的太阳米粒结构时无法工作。本文提出了一种基于图像能谱分析的焦点探测方法,该方法以图像能谱比的低频分量的平均值作为焦点探测评价函数,该方法能够消除目标信息的影响和平滑大气湍流的影响。实验证明,该方法的探测精度和探测时间分辨率能满足地基太阳望远镜不同观测目标的高分辨观测的需要。

Other Abstract

Intense solar radiation leads to thermal deformation of the solar telescope opto-mechanical system, triggering obvious time-varying focus shifts. Defocus aberration has an adverse effect on high-resolution observation and reduces the image spatial resolution. Therefore, the defocus aberration is necessary to be detected and compensated. Considering the effects of atmospheric turbulence, the focus detecting method based on Shack-Hartman wavefront detection which commonly used in astronomical telescopes is invalid at observing the solar limb and the low contrast solar granulation. The focus detecting method based on image power spectrum analysis is provided. This method used the averate value of the low-frequency components of the image spectrum ratio as the cost function for focus detection, which can effectively eliminate the impact of object structure and atmospheric turbulence. Experimental results show that the detecting accuracy and frequency of this method can meet the requirement of high-resolution observations for different objects on ground-based solar telescope.

Funding Project国家自然科学基金[11573068] ; 国家自然科学基金[11273059]
Funding Organization国家自然科学基金[11573068, 11273059]
Subject Area物理学 ; 光学 ; 天文学 ; 太阳与太阳系 ; 太阳与太阳系其他学科
MOST Discipline Catalogue理学 ; 理学::物理学 ; 理学::天文学
SubtypeJournal article (JA)
PublisherChinese Optical Society
EI Accession Number20173504103779
EI KeywordsTelescopes
EI Classification Number443.1Atmospheric Properties - 746Imaging Techniques - 921.5Optimization Techniques
Citation statistics
Document Type期刊论文
Corresponding Author金振宇
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
方玉亮,柳光乾,金振宇,等. 一种地基太阳望远镜焦点探测方法[J]. 光学学报(Acta Optica Sinica),2017,37(7):133-139.
APA 方玉亮,柳光乾,金振宇,李鹏飞,&刘忠.(2017).一种地基太阳望远镜焦点探测方法.光学学报(Acta Optica Sinica),37(7),133-139.
MLA 方玉亮,et al."一种地基太阳望远镜焦点探测方法".光学学报(Acta Optica Sinica) 37.7(2017):133-139.
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