| 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. |
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