NVST高分辨磁像仪的偏振定标及数据采集模式研究

发布时间：2018-04-24 07:35

本文选题：NVST高分辨磁像仪 + 磁像仪的数据采集模式　；参考：《中国科学院大学(中国科学院云南天文台)》2017年硕士论文

【摘要】：太阳磁场在太阳物理研究中具有重要意义,对太阳磁场的高分辨观测图像是研究太阳小尺度活动的主要依据。NVST目前已经能够对太阳进行高分辨的成像观测,正在进行高分辨磁像仪的研制。本文也是基于此开展的相关工作。要想实现太阳磁场的测量,对望远镜系统及磁像仪的偏振定标是必须步骤。文中设计了对KD*P型偏振分析器进行定标测量方案,并设计了对高分辨磁像仪中分束镜的测量方案,测量比较了不同分束镜偏振效应,对分束镜偏振特性的校准以及分束镜方案的选择具有重要意义。NVST的高分辨磁像仪设计采用同步重建技术来实现对太阳的高分辨磁场观测,因而磁像仪所采用的数据采集模式十分重要,会直接影响到图像的同步重建。本文中对高分辨磁像仪的数据采集方案进行了相关讨论,分析了KD*P型偏振分析器及CMOS相机特性对同步重建的影响。本文的创新点主要有:·设计了针对KD*P型偏振分析器进行参数测定的实验;·利用空气Mueller矩阵校准法对分束镜Mueller矩阵实现了高精度的测量。·针对NVST的高分辨磁像仪进行了数据采集模式的讨论,并提出了针对KD*P与COMS相机的同步测试系统;
[Abstract]:The solar magnetic field plays an important role in the study of solar physics. The high-resolution observation image of the solar magnetic field is the main basis for studying the small-scale activities of the sun. NVST has been able to make high-resolution imaging observations of the sun at present. A high-resolution magnetic imaging instrument is being developed. This paper is also based on the relevant work carried out. In order to realize the measurement of solar magnetic field, it is necessary to calibrate the polarization of telescope system and magnetograph. In this paper, the calibration measurement scheme of KD*P polarization analyzer is designed, and the measurement scheme of beam splitter in high resolution magnetic imaging instrument is designed. The polarization effect of different beam splitter is measured and compared. It is of great significance to calibrate the polarization characteristics of beam splitter mirror and to choose the scheme of beam splitter mirror. The high-resolution magnetic imaging instrument designed by NVST uses synchronous reconstruction technology to realize the high-resolution magnetic field observation of the sun. Therefore, the data acquisition mode used in the magnetic imaging instrument is very important, which will directly affect the synchronous reconstruction of the image. In this paper, the data acquisition scheme of high resolution magnetograph is discussed, and the influence of the characteristics of KD*P polarization analyzer and CMOS camera on synchronous reconstruction is analyzed. The main innovations of this paper are as follows: the experiment of parameter measurement for KD*P polarization analyzer is designed, the high precision measurement of Mueller matrix of beam splitter is realized by air Mueller matrix calibration method, and the high resolution magnetic imaging instrument for NVST is developed. The data acquisition model is discussed. A synchronous testing system for KD*P and COMS cameras is proposed.
【学位授予单位】：中国科学院大学(中国科学院云南天文台)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P182.7

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