基于里奥滤光器的太阳窄带观测系统全视场频率漂移高精度测量方法(特邀)  

High Precision Measurement Method of Wavelength Drift in Full Field of View for Solar Narrow Band Observation System Based on Lyot Filter(Invited)

作　　者：王希群 吕卓 王远方舟 付玉[1,3,4] 谭旭 金振宇 WANG Xiqun;LV Zhuo;WANG Yuanfangzhou;FU Yu;TAN Xu;JIN Zhenyu(Laboratory of Astronomical Technologies,Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216 China;University of Chinese Academy of Sciences,Beijing 100049 China;Yunnan Key Laboratory of Solar Physics and Space Science,Kunming 650216 China;Astronomical Techniques&Engineering Laboratory of Yunnan,Kunming 650216 China)

机构地区：[1]中国科学院云南天文台,昆明650011 [2]中国科学院大学,北京100049 [3]云南省太阳物理与空间目标监测重点实验室,昆明650011 [4]云南省应用天文技术工程实验室,昆明650011

出　　处：《光子学报》2023年第5期82-93,共12页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11833010,11773071);云南省科技领军人才项目(No.202105AB160001);云南省科技入滇项目(No.202003AD150019)。

摘　　要：针对地基大口径太阳望远镜的基于里奥滤光器的太阳窄带观测系统存在的频率漂移问题,提出了在线全视场频率漂移测量方法,并在NVST高分辨太阳光球观测实验系统进行了实测验证。实测表明,对全视场的频率漂移测量误差RMS小于0.1 pm。利用该方法测得的系统频率漂移可用于校正磁像仪的全视场频率漂移,提高太阳大气的磁场和速度场测量精度。The measurement and study of the Sun's magnetic field is an important branch of solar physics,most of the Sun's phenomena and processes are closely related to the magnetic of the Sun.Magnetograph is a solar narrowband observation system based on tunable filters.The magnetograph can measure the magnetic field and velocity field of the solar atmosphere with high accuracy and is a piece of important observation equipment for solar physics research.Due to processing and assembly errors and incidence angles in different fields of view,the central wavelength of the solar narrowband observation system will deviate from the calibrated wavelength,which is called wavelength drift.The wavelength drift of the observation system seriously affects the accuracy of the magnetic field and velocity field measurement.The wavelength drift must be measured accurately and corrected during the measurement of the magnetic field and velocity field.The wavelength drift is different for different fields of view.To achieve high-precision measurement of the magnetic field and velocity field,it is necessary to precisely measure the wavelength drift in the full field of view.Aiming at the wavelength drift problem of the narrowband solar observation system based on the Lyot filter of ground-based large aperture solar telescope,this paper proposes an online full-field wavelength drift measurement method.This method can realize the high-precision measurement of wavelength drifts in the full field of view without changing the structure of the observation system.Online measurement of system wavelength drift refers to scanning the system spectral lines based on the existing configuration of the observation system to obtain spectral profiles at each field of view.The line center of the field of view can be obtained by fitting the spectral profiles of different fields.The method of obtaining system wavelength by spectral profile scanning is an algorithm based on the light intensity.The fluctuation of light intensity at one field of view will affect th

关 键 词：频率漂移 滤光器 太阳磁场测量 同步采集 在线测量 多光谱成像 

分 类 号：O433.1[机械工程—光学工程]