抚仙湖太阳观测和研究基地知识库

针对1m太阳望远镜导星镜光轴与望远镜光轴在跟踪过程中的相对变化对光电导行系统的影响,从数值模拟和实测两方面进行了深入分析。首先介绍1 m太阳望远镜及其光电导行系统的基本结构,并建立主镜镜筒的基本有限元模型,分析弯沉随镜筒指向高度的变化规律,模拟有弯沉存在时引入的跟踪误差及变化规律。然后根据该望远镜的系统结构,提出了望远镜光轴相对于导星镜光轴变化的实测方法。最后通过实测数据获得了望远镜光轴相对于导星镜光轴变化随镜筒指向高度的变化规律。

In the tracking process of the YNAO 1m solar telescope,a deviation between the optic axes of the telescope and its guiding telescope will affect the auto-guiding tracking. This paper analyzes such a deviation with numerical simulation and measurement. We first introduce the basic structure of the 1m solar telescope and the auto-guiding system,set up the model for the telescope tube through the finite-element method,derive the relation of the deflection angle versus the altitude of the telescope,and simulate the track of a stellar image affected by the deflection angle. Considering the structure of the entire telescope,we propose a method for measuring a deviation between the optic axes to obtain the relation between the deflection angle and altitude. We finally use some observed data to find actual values of the relation.