Construction and Validation of a Geometry-based Mathematical Model for the Hard X-Ray Imager  

作　　者：Xian-Kai Jiang Jian Wu Deng-Yi Chen Yi-Ming Hu Hao-Xiang Wang Wei Liu Zhe Zhang 

机构地区：[1]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023.China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China

出　　处：《Research in Astronomy and Astrophysics》2023年第2期53-72,共20页天文和天体物理学研究（英文版）

基　　金：supported by the Strategic Priority Research Program on Space Science;Chinese Academy of Sciences(No.XDA 15320104);the Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant No.YJKYYQ20200077);the National Natural Science Foundation of China(Nos.12173100,12022302,11803093 and 11973097);the Youth Innovation Promotion Association,CAS(No.2021317 and Y2021087)。

摘　　要：Quantitative and analytical analysis of the modulation process of the collimator is a great challenge,and is also of great value to the design and development of Fourier transform imaging telescopes.The Hard X-ray Imager(HXI),as one of the three payloads onboard the Advanced Space-based Solar Observatory(ASO-S) mission,adopts modulating Fourier-Transformation imaging technique and will be used to explore the mechanism of energy release and transmission in solar flare activities.As an important step to reconstruct the images of solar flares,accurate modulation functions of HXI are needed.In this paper,a mathematical model is developed to analyze the modulation function under a simplified condition first.Then its behavior under six degrees of freedom is calculated after adding the rotation matrix and translation change to the model.In addition,unparalleled light and extended sources are also considered so that our model can be used to analyze the X-ray beam experiment.Next,applied to the practical HXI conditions,the model has been confirmed not only by Geant4 simulations but also by some verification experiments.Furthermore,how this model helps to improve the image reconstruction process after the launch of ASO-S is also presented.

关 键 词：INSTRUMENTATION detectors-Sun X-rays-gamma-rays-techniques image processing-methods ANALYTICAL 

分 类 号：P182.52[天文地球—天文学]