Exoplanet Direct Imaging System For Space Platform

In recent years,with the development of science and technology,the observation of exoplanets has become a research hotspot in astronomy,and scientific research institutions of various countries have done relevant research and work in this regard.At present,the schemes for observing exoplanets are mainly indirect detection systems and direct imaging systems.The observation capabilities of direct imaging systems have been significantly improved compared to the various indirect detection methods used before,which can expand related scientific research work has received extensive attention from the astronomical community.The main research content of this article is the direct imaging system of exoplanet based on space platform.Exoplanet direct imaging systems for space platforms are currently the focus of attention in the astronomy community.Direct imaging has greatly improved the observation capabilities compared to indirect detection.At the same time,the observation systems used for space platforms are compared to ground-based platforms,in the visible to near-infrared wave band,because it can avoid the influence caused by the atmosphere,it also has the advantage of observation,so that the acquired image has a higher imaging contrast.The core of this article is the optical design,tolerance analysis and stray light suppression analysis of the exoplanet direct imaging system.In this paper,the composition and technical principles of the exoplanet direct imaging system are first introduced,and the optical path and function of the key part of the coronagraph system are analyzed.The calculation method of the key parameters in the optical path is given and designed.A exoplanet coronagraph system including two optical paths for wavefront sensing and scientific imaging are presented,and its image quality evaluation method is given and its imaging quality is evaluated.Combined with the characteristics of the coronagraph system,the tolerance analysis of the designed coronagraph system was carried out,and the machinability of the system was verified under the premise that the tolerance was given reasonably.The stray radiation situation that the space coronagraph system will encounter in the actual work is studied,and the index of its stray light suppression ability is analyzed according to its system characteristics,and the designed coronagraph system is completed.3D modeling,and its stray light suppression ability was simulated in the simulationsoftware,and the improvement scheme was proposed and verified based on the simulation results.At the end,the article analyzes and summarizes the problems in the designed exoplanet coronagraph system,and puts forward the direction of improvement according to the problems,and prospects the prospect of direct imaging technology for space exoplanets.