摘要
作为抚仙湖1 m新真空太阳望远镜的观测终端之一,多波段光谱仪需具备2种观测模式:空间二维扫描观测及偏振光谱测量,从而实现诊断太阳矢量磁场及其动力学特征的科学目标。首先明确观测模式对3大重要光电机构(空间扫描机构、偏振分析器和仪器偏振定标机构)的基本要求;其次从实测太阳物理需要出发,分析这些要求的具体实现方法(连续式或步进式)、控制精度(10^(-2)或10^(-3))以及信噪比提高方法(多帧叠加或多组叠加)等;最后给出多种观测模式的流程图,并将不同观测模式集成于一个采集控制程序之中,投入实测,分别进行多组活动区二维空间扫描观测和黑子偏振光谱测量,取得了较好的结果。
As one of the observation terminals of the 1-meter New Vacuum Solar Telescope （NVST） at Fuxian-Lake, the multi-band spectrometer is required to have two observation modes, ie, spatial 2D scanning observation and speetropolarimetrie measurement, as to achieve diagnosis of solar vector magnetic fieht and its dynamic characteristics. The work of this paper is closely related to how to structure and realize the above two observation modes. Firstly, the basic requirements in observation modes of the three important photoelectric mechanisms （spatial scanning mechanism, polarization analyzer, and instrument polarization calibration mechanism） are made clear. Second, from practical solar physics requirements, the specific implementation methods of these requirements （ continuous or step-by-step ）, control accuracy （ 10-2 or 10-3 ）, and signal-to- noise ratio improvement method （ multi-frame supelt）osition or multi-group superposition） , are analyzed. Finally, flow charts of various observation modes are summarized, and different observation modes are integrated into one sampling control program which is put into practical measurement. Multiple groups of 2-D spatial scanning observations and sunspot speetropolarimetrie measurement are carried out with good results achieved.
作者
陈宇超
徐稚
李正刚
袁沭
柳光乾
许骏
金振宇
Chen Yuchao;Xu Zhi;Li Zhenggang;Yuan Shu;Liu Guangqian;Xu Jun;Jin Zhenyu(University of Chinese Academy of Sciences,Beijing 100049,China;Yunnan Observatories,Chinese Academy of Sciences,Kunming 650011,China)
出处
《天文研究与技术》
CSCD
2018年第4期423-431,共9页
Astronomical Research & Technology
基金
国家自然科学基金(11473064)资助
关键词
太阳光谱
偏振光谱测量
空间二维扫描
观测模式
Solar spectrum
Speetropolarimetrie observation mode
Raster spectroscopy
Observation mode
