基于焦面复制方法的自适应光学系统静态像差校正技术

张天宇; 王钢; 张熙; 窦江培

doi:10.37188/CO.2021-0182

基于焦面复制方法的自适应光学系统静态像差校正技术

doi: 10.37188/CO.2021-0182

张天宇^{1, 2, 3,},
王钢^{1, 2, ,},
张熙^{1, 2,},
窦江培^{1, 2,}

1.
中国科学院国家天文台南京天文光学技术研究所, 南京210042
2.
中国科学院天文光学技术重点实验室（南京天文光学技术研究所）, 南京210042
3.
中国科学院大学, 北京100049

基金项目: 国家自然科学基金项目（No. 11827804，No. U2031210，No. 11673042）；中国载人航天工程巡天空间望远镜专项科学研究经费（No. CMS-CSST-2021-A11）；中科院对外合作重点项目（No. 114A32KYSB20160057）；中科院战略性先导科技专项A类资助（No. XDA15010300）。

详细信息

作者简介:
张天宇（1992—），男，江苏南京人，博士研究生，2019年于桂林电子科技大学获得硕士学位，主要从事自适应光学自动控制方面的研究。E-mail: tyzhang2019@niaot.ac.cn

王　钢（1988—），男，黑龙江齐齐哈尔人，博士，2020年于中国科学院大学获得博士学位，主要从事太阳自适应光学并行优化算法及变形镜静态误差校正的研究。E-mail: gwang@niaot.ac.cn

张　熙（1984—），江苏南京人，男，博士，副研究员,硕士生导师，2013年于中国科学院大学获得博士学位，主要从事自适应光学和空间高对比度成像的研究。E-mail: xzhang@niaot.ac.cn

窦江培（1981—），男，河北衡水人，博士，研究员, 博士生导师，2009年于中国科学院研究生院获得天体物理学博士学位，主要从事太阳系外行星天文高对比度直接成像技术与实测研究。E-mail: jpdou@niaot.ac.cn

中图分类号: P111.3;TP391.8
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出版历程
- 收稿日期: 2021-10-27
- 修回日期: 2021-11-17
- 录用日期: 2022-01-21
- 网络出版日期: 2022-01-27
- 刊出日期: 2022-05-20

Staticaberration correction technique for adaptive optics system based on focal-plane copy approach

ZHANG Tian-yu^{1, 2, 3
,},
WANG Gang^{1, 2
, ,},
ZHANG Xi^{1, 2
,},
DOU Jiang-pei^{1, 2
,}

1.
National Astronomical Observatories / Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042, China
2.
CAS Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Nanjing 210042, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: Supported by the National Natural Science Foundation of China (No. 11827804, No. U2031210, No. 11673042); Special Scientific Research Funds for China′s Manned Space Project Sky Survey Space Telescope (No. CMS-CSST-2021-A11)；Key foreign cooperation projects, the Chinese Academy of Sciences (No. 114A32KYSB20160057); The Strategic Priority Research Program (category A) of the Chinese Academy of Sciences (No. XDA15010300)

More Information

Corresponding author: gwang@niaot.ac.cn

摘要

摘要: 限制自适应光学（Adaptive Optics, AO）系统表现的一个关键因素是由波前传感器所在路径和科学成像路径之间差异引起的非共光路像差（Non-Common Path Aberration,NCPA），同时AO系统共光路部分也会不可避免地引入静态像差。为此，本文提出了一种基于焦面点扩散函数（Point Spread Function,PSF）复制的技术，用于校正AO系统中的静态像差。此技术利用点光源产生的PSF图像作为参考图像，通过迭代优化算法控制可变形镜改变其面型，将参考PSF图像复制到AO系统科学成像路径。实验结果表明，校正后的斯特列尔比（Strehl Ratio，SR）从初始的0.312提高到0.995。此技术可以稳定、快速地获得全局校正结果，特别是在系统具有较大的初始静态像差时。
- 自适应光学 /
- 像差校正 /
- 高对比度成像
Abstract: A key factor limiting the performance of Adaptive Optics (AO) systems is the Non-Common Path Aberration (NCPA) caused by the difference between the wavefront sensor path and the science imaging path. Meanwhile, a static aberration will inevitably be introduced in the common path of the AO system. This paper proposes a correction technology based on a copy of the focal-plane Point Spread Function (PSF) to correct static aberration in the scientific imaging path of AO systems. This technology uses the PSF generated by the laser point light source as the reference PSF, and copies that to the science imaging path of the AO system through iterative optimization algorithms. Experimental results show that the Strehl Ratio (SR) increases from the initial 0.312 to 0.995 after correction. This technology can still stably and quickly obtain global optimization results, especially when the initial static aberration of the system is large.
- adaptive optics /
- aberration correction /
- high-contrast imaging

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图 1 校正系统原理图

Figure 1. Block diagram of the correction system

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图 2 焦面PSF图像。（a）初始图像；（b）校正后图像；（c）参考图像

Figure 2. The focal-plane PSF image. (a) Initial image; (b) corrected image; (c) reference image

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图 3 评价函数曲线

Figure 3. Metric function curve

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图 4 校正后波前图

Figure 4. The corrected wavefront map

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图 5 焦面能量优化方法校正后焦面PSF图像和波前图

Figure 5. PSF corrected by the focal plane energy optimization method and the corresponding corrected wavefront map

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图 6 瞳面方法校正后PSF图像和波前图

Figure 6. PSF corrected by the pupil plane approach and the corresponding corrected wavefront map

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表 1 校正前后系统各项Zernike系数

Table 1. Zernike coefficients of the system before and after correction

Zernike多项式系数	校正前	校正后
Astigmatism y	−0.029	0.001
Astigmatism x	0.127	-0.003
Trefoil y	0.013	0.000
Coma x	−0.038	−0.002
Coma y	−0.035	0.001
Trefoil x	0.028	−0.004
Tetrafoil y	0.009	−0.000
Secondary Astigmatism y	−0.040	−0.000
Primary Spherical	−0.061	0.003
Secondary Astigmatism x	0.035	0.000
Tetrafoil x	0.111	−0.002

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表 2 3种方法校正后Zernike系数

Table 2. Zernike coefficients corrected by 3 kinds of methods

Zernike 多项式系数	焦面能量优化法	瞳面校正法	焦面复制技术
Astigmatism y	0.039	0.009	0.001
Astigmatism x	0.003	0.002	−0.003
Trefoil y	0.001	0.002	0.000
Coma x	0.007	−0.002	−0.002
Coma y	−0.008	−0.001	0.001
Trefoil x	0.006	0.000	−0.004
Tetrafoil y	0.005	0.001	−0.000
Secondary Astigmatism y	−0.004	0.000	−0.000
Primary Spherical	−0.004	0.001	0.003
Secondary Astigmatism x	−0.034	−0.001	0.000
Tetrafoil x	−0.013	0.005	−0.002

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