中心开孔型四象限探测器光纤定位闭环控制方法  

Closed-loop control method of optical fiber positioning of centeropening four-quadrant detector

作　　者：王淋正 邹华[1] 黄硕 张航 赵世宇 Wang Linzheng;Zou Hua;Huang Shuo;Zhang Hang;Zhao Shiyu(College of Science,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学理学院,江苏南京210098

出　　处：《红外与激光工程》2020年第6期256-262,共7页Infrared and Laser Engineering

摘　　要：光纤定位技术是多目标光纤光谱望远镜中的关键技术,光纤定位精度是影响望远镜观测效率的重要因素,随着光谱巡天项目的开展,光纤定位单元的小型化、高密度化、集成化和高精度定位要求成为普遍趋势,这对光纤定位系统提出了更高技术要求和挑战。光纤定位技术也期望实现高精度的实时监测和反馈系统,形成有效的闭环控制。基于此提出了一种中心开孔型四象限探测器光纤定位技术,并利用二维高斯模型对中心开孔型四象限探测器定位算法进行了设计,该算法对单元光斑束腰单次标定,可实现高精度的多次实时光斑位置确定和光纤位置调整。利用光纤光谱仪望远镜原理搭建了模拟实验对此装置和算法的性能进行了模拟,应用此闭环控制方法,在四象限探测器零点偏置直径为4 mm、光纤截面积达到1000μm^2情况下,绝对定位误差可以控制在6μm之内,相对误差可控制在0.15%范围内,可以有效提高望远镜星象和光纤的耦合效率。Optical fiber positioning technology is a key technology in multi-target optical fiber spectroscopes.The accuracy of optical fiber positioning is an important factor affecting the observation efficiency of telescopes.With the development of the spectral survey project,the requirements for the optical fiber positioning unit to be miniaturized,high density,integrated and high precision positioning have become a general trend,which poses higher technical requirements and challenges for optical fiber positioning systems.Optical fiber positioning technology was also expected to achieve a high-precision real-time monitoring and feedback system,forming an effective closed-loop control.Based on the requirements,a center-opening four-quadrant(4-Q)detector fiber positioning technology was proposed,and a two-dimensional Gaussian model was used to design the centeropening four-quadrant detector positioning algorithm.The algorithm performs a single calibration of the unit beam spot waist,can achieve high precision multiple real-time spot position determination and fiber position adjustment.The performance of the device and algorithm was simulated with the experiment set up based on the principle of the optical fiber spectroscope telescope.With this closed-loop control method,the absolute positioning error was obtained when the four-quadrant detector had a zero offset diameter of 40 mm and a fiber cross-sectional area of 1000μm^2.It can be controlled within 6μm,and the relative error can be controlled within0.15%,which meets the requirements of the optical fiber spectroscope telescope fiber positioning technology.This device can be applied as an optical fiber positioning system.

关 键 词：光纤定位 四象限探测器 天文观测 

分 类 号：O439[机械工程—光学工程]