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大口径巡天望远镜分区域曲率传感方法研究

安其昌 吴小霞 张景旭 李洪文 朱嘉康

安其昌, 吴小霞, 张景旭, 李洪文, 朱嘉康. 大口径巡天望远镜分区域曲率传感方法研究[J]. 中国光学(中英文). doi: 10.37188/CO.2022-0117
引用本文: 安其昌, 吴小霞, 张景旭, 李洪文, 朱嘉康. 大口径巡天望远镜分区域曲率传感方法研究[J]. 中国光学(中英文). doi: 10.37188/CO.2022-0117
AN Qi-chang, WU Xiao-xia, ZHANG Jing-xu, LI Hong-wen, ZHU Jia-kang. Sub region curvature sensing method for survey telescope with larger aperture[J]. Chinese Optics. doi: 10.37188/CO.2022-0117
Citation: AN Qi-chang, WU Xiao-xia, ZHANG Jing-xu, LI Hong-wen, ZHU Jia-kang. Sub region curvature sensing method for survey telescope with larger aperture[J]. Chinese Optics. doi: 10.37188/CO.2022-0117

大口径巡天望远镜分区域曲率传感方法研究

doi: 10.37188/CO.2022-0117
基金项目: 国家自然科学基金项目(No. 62005279);中国科学院青年创新促进会(No. 2020221);中国科学院装备研制项目(No. YJKYYQ20200057);吉林省科技发展计划(No. 20220402032GH)
详细信息
    作者简介:

    安其昌(1988—),男,山西太原人,博士,助理研究员,中国科学院青年创新促进会成员。2011于中国科学技术大学获得工学学士学位,2018 年于中国科学院大学获得博士学位,现就职于中国科学院长春光机所,研究方向为大口径光机系统检测装调。Email:anjj@mail.ustc.edu.cn

  • 中图分类号: TH751

Sub region curvature sensing method for survey telescope with larger aperture

Funds: Supported by National Natural Science Foundation of China (No. 62005279); the Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2020221); the Equipment Development Project of the Chinese Academy of Sciences (No. YJKYYQ20200057); Jilin Science and Technology Development Program (No. 20220402032GH)
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  • 摘要:

    大口径巡天望远镜需要基于波前传感系统的反馈,进行主动光学闭环校正,以更好地发挥其极限探测能力。本文面向大口径巡天望远镜波前传感过程中,离焦星点像重合所导致的导星数量下降的问题,首先针对分区域曲率传感的基本理论表达进行了推导,之后,通过建立联合仿真模型,利用光学设计软件与数值计算软件之间的通讯交互,对分区域曲率传感的过程进行了仿真分析。最后,通过搭建桌面实验,分别就单目标与多目标的曲率传感进行了交叉比对,验证了算法的正确性。本文所提出的方法针对标准波前与单导星曲率传感相比,误差为0.02个工作波长(RMS),误差在10%以内,可在传统主动光学技术的基础上,通过扩展可用导星,提升探测信噪比与采样速度,有效提升主动光学系统校正能力。

     

  • 图 1  分区域传感过程图

    Figure 1.  Sub regional sensing process diagram

    图 2  导星重叠与离焦量之间的关系

    Figure 2.  Relationship between guide star overlap and defocus amount

    图 3  相互交叠的离焦星点像

    Figure 3.  Overlapping defocused star images

    图 4  分割拼接的离焦星点像(小像差)。(a)焦前能量分布;(b)焦后能量分布;(c)光强分布差分

    Figure 4.  Segmented and spliced defocused star point image (small aberration). (a) Pre-focal energy distribution; (b) post-focal energy distribution; (c) light intensity distribution difference

    图 5  小像差下的离焦星点像(a)重建波前与(b)原始波前

    Figure 5.  (a) Reconstructed wavefront and (b) original wavefront of stitching defocused starimage under small aberration

    图 6  小像差下的离焦星点像拼接复原效果。(a)重建波前与原始波前相关函数;(b)泽尼克系数对比

    Figure 6.  Restoration effect of defocused star image stitching under small aberration. (a) Comparison of correlation function between reconstructed wavefront and original wavefront; (b) Zernike coefficient

    图 7  大像差下的离焦星点像拼接结果。(a)重建波前与(b)原始波前

    Figure 7.  (a) Reconstructed wavefront and (b)original wavefront of stitching defocused star image under large aberration

    图 8  分割拼接的离焦星点像(大像差)。(a)焦前能量分布;(b)焦后能量分布;(c)光强分布差分

    Figure 8.  Segmented and spliced defocused star point image (large aberration). (a) Pre focal energy distribution; (b) post focal energy distribution; (c) light intensity distribution difference

    图 9  大像差下的离焦星点像拼接复原效果。(a)重建波前与原始波前相关函数与(b)泽尼克系数对比

    Figure 9.  Restoration effect of defocused star image stitching under large aberration (a) comparison of correlation function between reconstructed wavefront and original wavefront and (b) Zernike coefficient

    图 10  湍流对像差提取的影响。(a)焦前能量分布;(b)焦后能量分布;(c)光强分布差分;(d)短曝光重建波前;(e)长曝光重建波前;(f)原始波前

    Figure 10.  Influence of turbulence on aberration extraction. (a) Pre focal energy distribution; (b) post focal energy distribution; (c) light intensity distribution difference; (d) short exposure reconstruction wavefront; (e) long exposure reconstruction wavefront; (f) original wavefront

    图 11  (a)模拟双星检测强度分布;(b)实验现场及(c)两种形式的波前传感结果对比

    Figure 11.  (a) Simulated binary detection intensity distribution; (b) experimental site and (c) comparison of two wavefront sensing results

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  • 网络出版日期:  2022-08-12

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