A New Fiber Detection Method for LAMOST Based on the Front-illuminated Method  

作　　者：Ming Zhou Yong Zhang Guanru Lv Jian Li Zengxiang Zhou Zhigang Liu Jianping Wang Zhongrui Bai Yuan Tian Mengxin Wang Shuqing Wang Hongzhuan Hu Chao Zhai Jiaru Chu Zhijie Han Mingxu Liu Yiqiao Dong Hailong Yuan Yongheng Zhao Yaoquan Chu Haotong Zhang 

机构地区：[1]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology,Chinese Academy of Sciences,Nanjing 210042,China [4]University of Science and Technology of China,Hefei 230026,China

出　　处：《Research in Astronomy and Astrophysics》2022年第6期42-51,共10页天文和天体物理学研究（英文版）

基　　金：supported by the Maintenance and renovation project of Major Science and Technology foundational facility of the Chinese Academy of Sciences,DSS-WXGZ-2020-0009 and DSS-WXGZ-2021-0004;the support of the National Key R&D Program of China(2019YFA0405000);NFSC 12090041,U1931207,U2031207 and U1931126;the support of the National Natural Science for Youth Foundation of China(No.11603043);Guo Shou Jing Telescope(the Large sky Area Multi-Object fiber Spectroscopic Telescope,LAMOST)is a National Major Scientific Project built by the Chinese Academy of Sciences.Funding for the project has been provided by the National Development and Reform Commission;LAMOST is operated and managed by the National Astronomical Observatories,Chinese Academy of Sciences。

摘　　要：The double revolving fiber positioning technology is one of the key technologies for the success of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST).The accuracy of fiber positioning will directly affect the observation efficiency of LAMOST.To achieve higher fiber positioning accuracy,the original open-loop controlled fiber positioning system urgently needs to be upgraded into a closed-loop control system.The fiber detection is the most important part of the closed-loop controlled fiber positioning system.The back-illuminated detection method is usually used to detect the fiber position by directly detecting the light spot generated at the fiber end in the multi-fiber spectral surveys.In this paper,we introduce a new method to measure the fiber position based on the image of the front-illuminated LAMOST focal plane.The front-illuminated image does not require lighting devices inside the spectrograph,and it could reduce the instability and light pollution in the spectrograph end.Our method measures the fiber position by fitting the profile of the fiber pinhole with a 2D Gaussian function.A series of tests show that the relative position measurement precision of the front-illuminated method is about 012,and the method could have the same accuracy as the back-illuminated method once the system bias is calibrated by a simple radial correction function.The required fiber positioning accuracy of LAMOST is 04,and the new method satisfies the requirement of LAMOST fiber detection accuracy and could be used in the closed-loop fiber control system.

关 键 词：TECHNIQUES image processing-methods data analysis-instrumentation detectors 

分 类 号：P111[天文地球—天文学]