NVST高分辨率磁像仪控制系统研制

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	NVST高分辨率磁像仪控制系统研制
其他题名	Development of NVST High Resolution Magnetograph Control System
	王希群
学位类型	硕士
导师	柳光乾
	2018-07-01
学位授予单位	中国科学院大学
学位授予地点	北京
学位专业	天文技术与方法
关键词	高分辨磁像仪两通道序列斑点图同步采集高时空同步精度偏振调制状态同步
摘要	为获得高分辨率的太阳二维磁场数据，NVST磁像仪采用了“同光程异构图像重建”技术，通过信噪比高的光球图像获取大气传递函数来重建信噪比低的窄带偏振图像。这就对数据采集和控制提出了极高的要求，一是如何连续高速同步地采集两个通道的大量短曝光斑点图，并保证两个通道的每帧斑点图严格在时间上和空间上同步，二是如何保证用以统计重建的一组序列斑点图严格与偏振分析器的调制状态同步。为此，本论文开展了NVST磁像仪控制系统的相关研究工作。论文首先介绍了NVST高分辨率磁像仪设计的思想、采用的关键技术和国内外相关技术发展概况。通过分析基于“同光程异构图像重建”技术的磁像仪对控制系统的要求，包括切入切出系统、采集系统、偏振调制系统、滤光器以及远程控制等方面控制需求，阐述了控制系统的重点和难点，给出了系统的总体结构设计和基本工作流程。着重研究如何实现两个通道大量短曝光斑点图序列在高时空精度同步下连续同步地采集，给出了系统的详细同步时序设计和两通道sCMOS相机的帧曝光时序同步测试结果，并进行了同步采集实验，给出了同步采集斑点图的高分辨率统计重建结果，证明了系统结构和时序能满足“同光程异构图像重建”技术对序列斑点图采集的要求。进而详细介绍了NVST高分辨率磁像仪的两套偏振分析器：基于KD*P与旋转波片偏振调制的基本原理，以及偏振调制装调与两通道序列斑点图同步的要求，分别就两种偏振调制方试设计了同步控制时序并进行了相关测试和实验，初步获得了NVST高分辨率磁像仪对日面试观测的偏振图像。通过对NVST高分辨率磁像仪控制系统进行详细的分析和设计，以及大量的测试和实验，论证了控制系统能满足NVST高分辨率磁像仪功能和性能指标要求，NVST磁像仪控制系统能高效稳定地工作。
其他摘要	In order to obtain high resolution solar magnetic field data, the NVST magnetograph uses the technology of "same optical path with different structure image reconstruction". The atmospheric transfer function is obtained through a photosphere image with a high SNR to reconstruct a narrowband polarization image with a low SNR. This puts high requirements on data acquisition and control. The first is how to obtain a large number of short-exposure spot images of two channels continuously and at high speed, and ensure that each frame of two channels is strictly synchronized in time and space. The second is how to ensure that a set of sequence spot images used for statistical reconstruction are strictly synchronized with the polarimetry’s modulation state. For this reason, the related research work of NVST magnetograph control system is carried out in this paper.Firstly, the paper introduces the design idea of NVST high resolution magnetograph, the key technology used and the development of related technologies at home and abroad. The requirements of the control system of the magnetograph based on the same optical path with different structure image reconstruction technology are analyzed. The key points and difficulties of the control system are described. And the overall structure design and basic work flow of the system are given. It focuses on how to implement a series of short-exposure burst images with two channels in continuous acquisition under high temporal and spatial accuracy synchronization. The detailed synchronization timing design of the system and the frame exposure timing synchronization test results of the two-channel sCMOS camera are given. The synchronous acquisition experiment was carried out, and the high resolution statistical reconstruction results of the synchronously acquired spot images were given. It was proved that the system structure and timing can meet the requirements of the “same optical path with different structure image reconstruction” technology for sequence spot images acquisition. Then two sets of polarimetry analyzers of NVST high resolution magnetograph are introduced in detail: the basic principle of polarization modulation based on KD*P and rotating wave plate, and the requirements for the synchronization of polarization modulation and two-channel sequential spot images, respectively. In this kind of polarization modulation test, synchronous control timings were designed and related tests and experiments were carried out. The polarization images of the NVST high-resolution magnetic imager on the sun disk were initially obtained.Through detailed analysis and design of NVST high-resolution magnetograph control system, as well as a large number of tests and experiments. It is demonstrated that the control system can meet the functional and performance requirements of the NVST high resolution magnetograph. The NVST magnetograph control system can work efficiently and stably.
学科领域	天文学 ; 天文学其他学科 ; 电子、通信与自动控制技术 ; 自动控制技术
学科门类	理学 ; 理学::天文学 ; 工学 ; 工学::电子科学与技术（可授工学、理学学位） ; 工学:::控制科学与工程
页数	57
语种	中文
文献类型	学位论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/25406
专题	天文技术实验室
作者单位	中国科学院云南天文台
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	王希群. NVST高分辨率磁像仪控制系统研制[D]. 北京. 中国科学院大学,2018.

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