四棱锥传感器在空间光干涉望远镜共相中的应用

颜召军; 郑立新; 王超燕; 蔡建清; 陈欣扬; 周丹

doi:doi:10.3788/gzxb20184711.1128002

光子学报, 2018, 47 (11): 1128002, 网络出版: 2018-12-17

四棱锥传感器在空间光干涉望远镜共相中的应用

Application of Pyramid Sensor for Co-phasing Space Optical Interferometric Telescope

论文大纲

颜召军 ^*郑立新王超燕蔡建清陈欣扬周丹

作者单位

中国科学院上海天文台光学天文技术研究室,上海200030

天文光学望远镜共相空间望远镜干涉四棱锥 Astronomical optics Space telescope Co-phasing Interferometry Pyramid

摘要

针对空间光干涉望远镜提出了一种基于四棱锥波前传感器的相位平移误差检测与闭环校正方法.该方法依次在三种不同波长条件下, 用四棱锥传感器检测两两子镜间的平移误差, 并依据实时测量结果控制子镜产生相应的校正平移量, 直到将平移误差校正到所用半波长的整数倍, 而后根据已知的波长数据和子镜平移量数据计算得到真实的平移误差, 进而对平移误差进行闭环校正.以两个子镜构成的空间望远镜为研究对象, 对该检测与闭环校正方法进行了仿真验证.仿真结果表明, 该方法可在500 μm范围内对相位平移误差进行准确闭环校正, 具有纳米级的精度与良好的重复性.

Abstract

An innovative piston error detecting and close loop correction method based on pyramid wavefront sensor was proposed for space optical interferometric telescope. Three different wavelengths are used in turn in the method, in which the pyramid sensor is used to measure the piston errors between sub-mirrors, and then the sub-mirrors are controlled to compensate the corresponding piston errors based on the real-time measurement results until the piston errors reach an integral multiple of half of the used wavelength. After that, the real values of piston error are calculated based the known data of wavelengths and quantities of piston compensation of sub-mirrors, and finally the piston errors can be controlled by closed loop correction. The proposed method was analyzed theoretically and researched by simulations in which a telescope with two sub-apertures was taken as research object. The results proved that the piston error between two sub-apertures can be soundly detected and corrected while the piston error is not more than 500 μm. In addition, the novel method meets the precision of nanometer and has good repeatability.

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颜召军, 郑立新, 王超燕, 蔡建清, 陈欣扬, 周丹. 四棱锥传感器在空间光干涉望远镜共相中的应用[J]. 光子学报, 2018, 47(11): 1128002. YAN Zhao-jun, ZHENG Li-xin, WANG Chao-yan, CAI Jian-qing, CHEN Xin-yang, ZHOU Dan. Application of Pyramid Sensor for Co-phasing Space Optical Interferometric Telescope[J]. ACTA PHOTONICA SINICA, 2018, 47(11): 1128002.

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