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一米红外太阳塔的光轴变化测量及其改正
其他题名Measurement of Change of Optic Axis of the 1m Infrared
校启公
学位类型硕士
导师刘忠
2012-04
学位授予单位中国科学院研究生院(云南天文台)
学位授予地点北京
学位专业天文技术与方法
关键词一米红外太阳望远镜 光电导行 光轴变化 像场旋转 星像轨迹
摘要一米红外太阳望远镜是我国目前唯一的地平式真空望远镜,科学目标要求其导行闭环跟踪精度达到0.3角秒。导行系统采用独立导行镜,导行过程中必须保证导行镜光轴与望远镜光轴平行,但由于受重力的影响,望远镜光轴会产生弯沉,另外导行镜光轴和安装基座等因素都会导致两个系统的光轴变化,从而降低导行精度,因此必须对其进行测量,并加以改正。 论文第一章介绍了一米红外太阳望远镜的主体结构及其光学系统,分析了重力形变对其光学结构的影响。然后介绍了两种光轴变化的测量和实时校正方法。通过分析其优劣提出适合一米红外太阳望远镜的测量方法,并根据该望远镜的控制系统结构,论证其可行性。 第二章就光轴的变化对跟踪精度的影响进行数值模拟。首先建立望远镜镜筒形变的有限元模型,分析了弯沉量随镜筒指向高度的变化。然后重点模拟了有光轴变化作用下,进行光电导行闭环跟踪某一颗星时,望远镜系统会产生的跟踪误差和星像轨迹,并具体的给出星像在望远镜M4平面和高分辨成像系统中的变化轨迹,建立了从跟踪误差中求解光轴随镜筒指向高度变化的方法。 第三章根据一米太阳望远镜的系统结构,并结合第二章的数值模拟,探讨如何建立光轴变化的实测系统,并就系统中光轴的初始位置标定方法、系统误差和影响因素进行分析,提出切实可行的测量方法、测量系统和测量步骤。 第四章通过对星进行长时间地闭环跟踪,建立了一米红外太阳塔望远镜光轴和导行镜光轴的相对变化随镜筒指向高度的变化规律,然后对导行镜引入实时改正模型。进行改正后的观测结果表明光轴变化是二维的,即光轴变化不但会影响望远镜的指向高度角,也影响方位角,导行镜要在两个控制方向上都要建立改正模型。 最后,对该论文的工作进行了总结,指出目前测量系统的不足,并就进行进一步精确测量和改正时,对测量系统提出了改善要求。
其他摘要The 1m Infrared Solar Telescope is the only altazimuth vacuum-tube telescope in our country,and its auto-guiding tracking precision must reach to 0.3 arc-second for scientific purpose.The auto-guiding system is a independent guiding telescope,and can only work under the condition of high parallelism of optic axis between the guiding telescope and the main telescope.Gravity can cause bend of optic axis of the main telescope,the mounting base of guiding telescope is unstable,all of these will cause the relative change of optic axis of the two systems,and lower the guiding tracking precision,so this change must be measured and eliminated. In the first chapter,the structure and optic system of the 1m Infrared Solar Telescope are introduced,and the effect on optic structure by gravity deformation is anslyzed.Then this paper introduce two methods that can test and real-time eliminate the change of optic axis,analyze their strength and weakness,propose proper testing method for the 1m Infrared Solar Telescope and prove its practicability according to control system of the telescope. In the second chapter,the effect on tracking precision by the change of optic axis is simulated.Firstly this paper set up a model for the telescope tube by the way of finite element,analyze the relationship between deformation and telescope's altitude,then analyze the tracking error and star track with the change of optic axis in the process of tracking a star by auto-guiding system,and simulate the star on both M4 and high resolution image-forming system,find the way to get the relationship between optic axis and telescope's altitude from the tracking error. In the third chapter,the measurement system is set up according to the system structure of the 1m Infrared Solar Telescope and the simulation result in the second chapter,and calibration of the original position of the optic axis,system error and its influencing factors are analyzed,and finally viable measurement method,measurement system and measrement steps are proposed. In the fourth chapter,the relationship between relative change of optic axis and telescope's altitude is obtained by long-time guiding tracking for a star,and then modified model is added to the guiding telescope.The observed data after modified illustrate that optic changes in two dimensions,not only it can change telescope's altitude,but also can change azimuth,so the guiding telescope must be modified in two dimentions. In the end,this paper summarize its content,point out the weakness in present measurement system,as well as the improved orientation for the next high precision measurement and correction.
学科领域天文学
语种中文
文献类型学位论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/4903
专题抚仙湖太阳观测和研究基地
推荐引用方式
GB/T 7714
校启公. 一米红外太阳塔的光轴变化测量及其改正[D]. 北京. 中国科学院研究生院(云南天文台),2012.
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