用于太阳光谱测量的光纤积分视场单元系统  

Fiber Integral Field Unit System for Measurement of Solar Spectrum

作　　者：孙伟民[1] 陈旭东 闫奇[1,2] 耿涛 严云翔 汪盛佳 王安之 王佳斌 金夕人 蒋航 王秀 赵闯 钟悦 梁昱[4] 宋智明 王鹏飞[1] SUN Wei-min;CHEN Xu-dong;YAN Qi;GENG Tao;YAN Yun-xiang;WANG Sheng-jia;WANG An-zhi;WANG Jia-bin;JIN Xi-ren;JIANG Hang;WANG Xiu;ZHAO Chuang;ZHONG Yue;LIANG Yu;SONG Zhi-ming;WANG Peng-fei(College of Physics and Optoelectronic Engineering of Harbin Engineering University,Harbin 150001,China;Yantai Research Institute of Harbin Engineering University,Yantai 264006,China;Qingdao Innovation and Development Center of Harbin Engineering University,Qingdao 266000,China;Yunnan Observatories,Chinese Academy of Sciences,Kunming 650011,China)

机构地区：[1]哈尔滨工程大学物理与光电工程学院,纤维集成光学教育部重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工程大学烟台研究院,山东烟台264006 [3]青岛哈尔滨工程大学创新发展中心,山东青岛266000 [4]中国科学院云南天文台,云南昆明650011

出　　处：《光谱学与光谱分析》2023年第4期1168-1174,共7页Spectroscopy and Spectral Analysis

基　　金：天文联合基金项目(U1931206,U1831115,U2031130);国家自然科学基金项目(12103015)资助。

摘　　要：三维成谱成像技术是一种能够对观测视场中的所有展源目标进行实时光谱获取的技术,它可以通过单次采样同时获得目标光谱域和二维空间域信息。光纤积分视场单元(IFU)则是天文三维成谱成像技术的关键器件,通过将接收的像面切分,将像面信息细分到若干单元传递至光谱仪,在此过程中二维的展源目标被重整为互不干扰的线性排列供光谱仪进行采样提取,能有效提高天文观测的时间分辨率。介绍一种具有242光纤单元的IFU,该IFU目前应用于中科院云南天文台的光纤阵列太阳光学望远镜(型号FASOT-1B)系统。为满足FASOT-1B的指标要求,获得高传输效率、高光谱分辨率和高时间分辨率观测效果,该IFU采用微透镜阵列加光纤阵列的结构,该微透镜为正六边形球面镜,实现接近100%的空间填充率。综合考虑光纤积分视场单元前置望远镜系统和后端光谱仪系统的设计参数,优化设计了一对11×11的微透镜阵列,相邻微透镜间距300μm,每个微透镜对应天区1.5″,以焦比F/8.2将接收到的光汇入与其对应的光纤纤芯中。系统分析光纤芯径与光谱仪光谱分辨率间的关系,设计的光纤规格为:35/105/125μm,该设计既能满足光纤接收微透镜所传递的全部光信息,同样可以得到系统需求的光谱分辨率和相对短的狭缝宽度。量化分析IFU阵列端光纤直径与微微孔深度对光纤实际入射焦比的影响,选定的微孔尺寸直径130μm,深3 mm。阵列端二维排布的光纤在赝狭缝端经过重整,以线性排列将光信息导入光谱仪,相邻光纤间距130μm。整个IFU的能量传输效率均值77.7%,波动值RMS 1.6%;所有光纤出射焦比EE90均慢于F/7。IFU出射端(赝狭缝端)光纤横向(排列方向)偏移量RMS值小于2.7μm,纵向(垂直于排列方向)偏移量RMS值小于1.8μm。FASOT-1B系统安装IFU并调试后进行了验证性观测,成功获取了太阳NOAA12738活动区MgI色球的斯托克�Astronomical three-dimensional spectral imaging technology is a real-time spectral acquisition technology for all source targets in the observation field of view.It can simultaneously obtain the spectral domain and two-dimensional spatial domain information of the target by single sampling.Optical fiber integral field unit(IFU)is the key component of astronomical threedimensional spectral imaging technology.The image plane information is subdivided into several units and transmitted to the spectrometer through the segmentation of the received image plane.In this process,the two-dimensional spread source target is reorganized into a non-interference linear array for sampling and extraction by the spectrometer,which can effectively improve the temporal resolution of astronomical observation.This paper introduces an IFU with 242fiber units,currently applied to the fiber array solar optical telescope(FASOT-1B)system of Yunnan Observatory of the Chinese Academy of Sciences.In order to meet the index requirements of FASOT-1Band obtain the observation effect of high transmission efficiency,high spectral resolution and high time resolution,the IFU adopts the structure of a microlens array and fiber array.The microlens is a regular hexagon spherical mirror,and the spatial filling rate is nearly 100%.Considering the design parameters of the front telescope system and the back-end spectrometer system of the fiber integral field-of-view unit,apair of 11×11microlens arrays is an optimized design.The distance between adjacent microlens is 300μm,and each microlens corresponds to the sky area fs16 of 1.5″.The received light is incorporated into the corresponding fiber core with the focal ratio F/8.2.The relationship between fiber core diameter and spectral resolution of the spectrometer is analyzed systematically.The design specifications of the fiber are 35/105/125μm.This parameter can not only meet the requirements of the optical fiber to receive all the optical information transmitted by the microlens but also can obtain

关 键 词：三维成谱成像 光纤阵列太阳光学望远镜 积分视场单元 太阳光谱 

分 类 号：P182.2[天文地球—天文学]