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摆镜在NVST图像稳定控制系统中的应用研究
Alternative TitleThe Study of Application about the Tip-tilt Mirror Image Stabilized Control System in NVST
李玉艳
Subtype硕士
Thesis Advisor柳光乾
2015-07-01
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Discipline天文技术与方法
KeywordNvst 随机风载 二维摆镜 图像稳定控制系统 数值模拟 实验分析
Abstract一米红外太阳望远镜(New Vacuum Solar Telescope,简称NVST)安放在云南澄江抚仙湖东北岸,主要是对太阳进行高分辨率的成像和光谱观测。为了保证观测时良好的圆顶视宁度,采用了圆顶移开并远离望远镜的敞开式观测模式,加上望远镜本身的结构特点以及该台址常年平均风速较大,使得该望远镜跟踪系统受随机风载的干扰较大。表现为NVST在观测的过程中,太阳像会随风出现较大幅度的低频抖动,严重影响终端光谱仪等系统的观测。为了解决这一问题,本论文开展了基于二维摆镜的图像稳定控制系统的相关研究工作。论文首先在第二章分析了在随机风载影响下光电导行系统和TiO高分辨率成像系统图像在随机风载下图像抖动的特点,并提出了两种稳定随机风载引起图像抖动的方案。第三章介绍了控制系统的主要硬件参数,并对摆镜及其驱动控制器的核心器件进行了性能测试分析。然后根据摆镜的性能测试结果,在第四章中对摆镜图像稳定控制系统建立了传递函数模型,并对提出的两种控制方案分别进行了数值模拟分析。对比分析了两种方案下的数值模拟的结果,并在论文的第五章重点实验分析了摆镜图像稳定闭环控制系统稳定随机风载引起的图像抖动性能。论文以深入的数值模拟分析和部分实验分析表明,在5到6级风作用的情况下,摆镜图像稳定闭环控制系统工作在25Hz就能将一米红外太阳望远镜焦面图像抖动的RMS值控制在0.5角秒以内,从而表明二维摆镜的图像稳定闭环控制系统是可以稳定该望远镜由随机风载引起的图像抖动的。
Other AbstractOne Meter Solar Telescope (or named New Vacuum Solar Telescope,NVST for short) is located at the northeast side of Fuxian Lake,Yunnan, and its main goals are high resolution imaging and spectral observations. In order to ensure good dome seeing while observation ,NVST use open observation mode of dome away the telescope.In addition,the telescope structural characteristics and station’s lake breeze is obvious, the telescope tracking system is impacted greatly by the wind,which leads to the sun image substantial jitter in low frequency.It seriously affects observations,such as the terminal spectrometer system.To solve this problem,this paper performed the study on image stabilization control system based on two-dimension tip-tilt mirror. Firstly,the second part of this paper analyzed the image jitter characteristics of auto guide unit and TiO high resolution imaging system under random wind loads,and then proposed two schemes about stabilizing image jitter causing by random wind loads.The third part described the major hardware parameters and tested the tip-tilt and drive controller’s performance.Base on the performance of tip-tilt mirror,the fourth part established the transfer function of the tip-tilt mirror image stabilization control system,and made umerical simulation analysis on two schemes. Comparative analysis of the results of the numerical simulation under two schemes,the fifth part focus on experimental analysis of tip-tilt mirror image stabilization closed-loop control system’s performance on stabilizing the image jitter under random wind loads. By in-depth numerical simulation analysis and part of experiment,this paper showed that in five to six wind action,the focal plane image of One Meter Solar Telescope can be controlled within 0.5 arcsec when the tip-tilt mirror image stabilization closed-loop system is woking at 25Hz,which indicated that the two-dimension tip-tilt mirror image stabilization closed-loop system can stabilize the image jitter causing by random wind load.
Subject Area天文学
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9459
Collection抚仙湖太阳观测站
Affiliation中国科学院云南天文台
Recommended Citation
GB/T 7714
李玉艳. 摆镜在NVST图像稳定控制系统中的应用研究[D]. 北京. 中国科学院研究生院,2015.
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