Design And Analysis Study Of A 5-Mirror Derotation System Based On AIMS

In order to improve the spatial resolution of astronomical telescopes,the aperture of today’s astronomical optical telescopes has become larger and larger.These large astronomical telescopes have high requirements on the quality of the images received by terminal observation instruments.Generally,the optical telescope will produce two kinds of image rotation during the tracking observation,one is the rotation of the object field of view,and the other is the rotation of the image field of view.In order to obtain a stable observation image,it is necessary to compensate for the rotation of the field of view of the telescope before the light enters the observation device,that is,to derotate.The main research purpose of this thesis is to provide a reliable derotation scheme for the national major scientific research instrument development project AIMS(Mid-Infrared Observation System for the accurate measurement of the solar magnetic field)solar telescope.The derotation system adopted by AIMS is a 5-mirror derotation system.However,the optical design,structural design and analysis,error analysis and installation of this 5-mirror derotation system are all issues that need to be studied.The main research content of this paper includes the following aspects:(1)Analyze the cause of the field of view rotation of the ground-level telescope,calculate the rules of the field of view rotation,and use MATLAB to give the calculation results of the field of view rotation.Using the object transformation matrix and rotation transformation matrix to study the derotation principle of the 5-mirror derotation system.The research results show that the 5-mirror derotation system can meet the requirements of AIMS racemization under certain racemization conditions.(2)Based on ZEMAX optical design software,the optical design of 5-mirror is completed,and the aperture,volume and angle of 5-mirror are given.Using the design software Solidworks,the mechanical structure design and three-dimensional modeling of the 5-mirror derotation system were carried out,so that it could meet the requirements of processable assembly and optical path of telescope.(3)Using Ansys analysis software to carry out static and dynamic modal analysis of the main components of the system,so that it can meet the actual requirements of the installation and adjustment of the structure in the static and dynamic aspects.Using ZEMAX to analyze the optical error of the 5-mirror derotation system,the error range and the source of sensitive error that meet the requirements of the racemization accuracy are obtained,thus guiding the assembly experiment.(4)Assemble and adjust the optical structure and mechanical structure of the 5-mirror derotation system,and propose and implement the installation and adjustment scheme and optical path of the 5-mirror derotation system.