摆镜在NVST图像稳定控制系统中的应用研究

发布时间：2018-01-16 02:34

本文关键词：摆镜在NVST图像稳定控制系统中的应用研究　出处：《中国科学院研究生院(云南天文台)》2015年硕士论文　论文类型：学位论文

【摘要】：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。
[Abstract]:The 1-meter infrared solar telescope, New Vacuum Solar Telescope, is located on the northeast shore of Fuxian Lake, Chengjiang, Yunnan Province. High resolution imaging and spectral observation of the sun are mainly carried out. In order to ensure a good dome apparent degree, the open observation mode of the dome moving away and away from the telescope is adopted. Combined with the structural characteristics of the telescope itself and the large annual average wind speed at the site, the tracking system of the telescope is greatly disturbed by random wind load, which is manifested in the observation process of NVST. In order to solve this problem, the solar image will appear a large amplitude of low-frequency jitter with the wind, which seriously affects the observation of the terminal spectrometer and other systems. In the second chapter, the photoconductive system and TiO high resolution imaging system under random wind load are analyzed. The characteristics of image jitter under wind-load. Two schemes of image jitter caused by steady random wind load are proposed. In chapter 3, the main hardware parameters of the control system are introduced. The core components of the pendulum mirror and its driving controller are tested and analyzed. Then, according to the performance test results of the pendulum mirror, the transfer function model of the image stability control system of the pendulum mirror is established in Chapter 4th. The numerical simulation results of the two control schemes are compared and analyzed. In the 5th chapter of the thesis, the image jitter performance caused by stable random wind load of the closed loop control system of pendulum image stabilization is analyzed. In the case of 5 to 6 grades of wind, the RMS value of focal plane image jitter of 1 meter infrared solar telescope can be controlled within 0. 5 angle seconds when the closed loop control system of pendulum image stability works at 25 Hz. It is shown that the image stability closed-loop control system of two-dimensional pendulum mirror can stabilize the image jitter caused by random wind load of the telescope.
【学位授予单位】：中国科学院研究生院(云南天文台)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P111.41

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