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基于色散干涉图像的拼接望远镜共相零位标定方法研究

颜召军 陈欣扬 郑立新 丁媛媛 朱能鸿

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基于色散干涉图像的拼接望远镜共相零位标定方法研究

颜召军, 陈欣扬, 郑立新, 丁媛媛, 朱能鸿

Zero co-phasing reference calibration method based on dispersed interferogram for segmented mirror telescope

Yan Zhao-Jun, Chen Xin-Yang, Zheng Li-Xin, Ding Yuan-Yuan, Zhu Neng-Hong
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  • 镜面拼接是一种提高望远镜分辨率的有效方法,拼接子镜间的相位平移误差是影响拼接望远镜成像质量的重要因素.针对当前拼接望远镜中的共相问题,提出了色散干涉图像峰值比值为评价函数的共相零位标定方法.以两个子镜为研究对象,对该共相零位标定方法进行了仿真验证,并搭建了两孔径共相零位标定实验平台,验证了基于色散干涉图像的拼接望远镜共相零位标定方法的可行性.实验结果表明,该方法不受2模糊性问题影响,可在几百微米共相误差范围内以10 nm左右精度对共相零位进行标定,解决了现有标定方法动态范围受限的问题.
    Astronomical telescopes with increasingly large apertures are required to upgrade the limit of diffraction and collect the light efficiently for the purpose of observing fainter and more remote objects with higher angular resolution. However, it is universally believed that traditional techniques of manufacturing, polishing and measuring large glass mirrors will soon face some practical challenges. Therefore, 10-m class or larger ground-based telescopes will need to employ arrays of several smaller segments to assemble into a large primary mirror. For a telescope with segmented mirrors, the piston errors between segments must be adjusted to nearly zero according to the requirements in order to be integrated into a single optical surface, which is known as co-phasing. One of the current co-phasing techniques, which has been successfully applied to Keck telescopes, employs an integration of edge sensors to detect the mirror shapes in real time with an optical phasing sensor to offer zero references for these sensors regularly. Another technique is demonstrated by use of a pyramid wavefront sensor (PWFS) to align and co-phase segmented mirrors in an active control close-loop with a single measurement. The co-phased best flat positions of segments are used as the zero references in order to measure the interaction matrix between the PWFS and the segmented mirrors. So it must be addressed that how the zero co-phasing reference is calibrated with high precision in a large capture range on the issues of co-phasing segmented mirrors. The current methods either lack accuracies, or just measure piston errors correctly in a small range. In order to solve the problem, a zero co-phasing reference calibration method based on dispersed interferogram is proposed. Specifically, the idea of the method is to define an appropriate cost function which is used to evaluate the piston errors between segments. Then it will be easy to determine the zero co-phasing reference position while all the cost function values are calculated based on the dispersed interferogram data with different piston errors inside the capture range. The proposed cost function is defined as the sum of the ratios of the second peak to the third peak of each of the columns of the two-dimensional dispersed interferogram, whose intensity distribution is along the dispersion direction. The precision and dynamic range of the method are analyzed theoretically and studied by simulations. Furthermore, the optical experiment is set up to demonstrate the efficacy of the method. In the experiment a scanning procedure is applied to one mirror and the dispersed interferograms between two mirrors with different piston errors are obtained. And then, the cost functions of these dispersed interferograms are computed through which the zero co-phasing reference position is located. The experimental results prove that the zero co-phasing reference between two mirrors can be calibrated within an accuracy of about 10 nm by making use of the proposed method. In addition, the novel method solves the problem of 2 ambiguity. Besides its sub-millimeter level wide capture range, this new co-phasing detecting method provides a helpful reference for relevant studies.
      通信作者: 颜召军, zhaojunyan@shao.ac.cn
    • 基金项目: 国家自然科学基金(批准号:11403079)资助的课题.
      Corresponding author: Yan Zhao-Jun, zhaojunyan@shao.ac.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11403079).
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  • [1]

    List of largest optical reflecting telescopes. https://en.wikipedia.org/wiki/List_of_largest_optical_reflecting_telescopes 2016-06-13

    [2]

    van Dam M A, Le Mignant D, Macintosh B A 2004 Appl. Opt. 43 5458

    [3]

    Shi J R 2016 Chin. Sci. Bull. 61 1330(in Chinese) [施建荣2016科学通报61 1330]

    [4]

    Nelson J, Sanders G H 2008 SPIE 7012 70121A

    [5]

    Johns M, McCarthy P, Raybould K, Bouchez A, Farahani A, Filgueira J, Jacoby G, Shectman S, Sheehan M 2012 SPIE 8444 84441H

    [6]

    Schumacher A, Devaney N, Montoya L 2002 Appl. Opt. 41 1297

    [7]

    Chanan G, Troy M, Dekens F, Michaels S, Nelson J, Mast T, Kirkman D 1998 Appl. Opt. 37 140

    [8]

    Chanan G, Ohara C, Troy M 2000 Appl. Opt. 39 4706

    [9]

    Chanan G, Pintó A 2004 Appl. Opt. 43 3279

    [10]

    Shi F, Chanan G, Ohara C, Troy M, Redding D C 2004 Appl. Opt. 43 4474

    [11]

    Shi F, Redding D C, Green J J, Ohara C 2004 SPIE 5487897

    [12]

    Shi F, Redding D C, Bowers C W, Lowman A E, Basinger S A, Norton T A, Peter P, Pamela S D, Mark E W, Ray B 2000 SPIE 4013 757

    [13]

    Zhang Y, Zhang L, Liu G R, Wang Y F, Zhang Y J, Zeng Y Z, Li Y P 2011 Acta Opt. Sin. 31 0212004(in Chinese) [张勇, 张靓, 刘根荣, 王跃飞, 张亚俊, 曾裔中, 李烨平2011光学学报31 0212004]

    [14]

    Luo Q, Huang L H, Gu N T, Li F, Rao C H 2012 Acta Phys. Sin. 61 069501 (in Chinese) [罗群,黄林海,顾乃庭,李斐,饶长辉2012物理学报61 069501]

    [15]

    Esposito S, Pinna E, Puglisi A, Tozzi A, Stefanini P 2005 Opt. Lett. 30 2572

    [16]

    Liu Z, Wang S Q, Rao C H 2012 Acta Phys. Sin. 61 039501 (in Chinese) [刘政, 王胜千, 饶长辉2012物理学报61 039501]

    [17]

    Liu Z, Wang S Q, Rao C H 2012 Chin. Phys. B 21 069501

    [18]

    Yan Z J, Chen X Y, Yang P Q, Zhou D, Zheng L X, Zhu N H 2015 Acta Phys. Sin. 64 149501 (in Chinese) [颜召军, 陈欣扬, 杨朋千, 周丹, 郑立新, 朱能鸿2015物理学报64 149501]

    [19]

    Hénault F 2009 J. Opt. A: Pure Appl. Opt. 11 125503

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出版历程
  • 收稿日期:  2016-06-06
  • 修回日期:  2016-07-15
  • 刊出日期:  2016-10-05

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