针对ASO-S/HXI光栅摆放角分布的测试与分析

Tests and Analysis of the Arrangement Configurations for ASO-S/HXI Grids and Their Effect on Imaging

先进天基太阳天文台(ASO-S)卫星的3大载荷之一硬X射线成像仪(Hard X-ray Imager,HXI)是一套基于傅立叶变换调制成像技术的望远镜.它利用91组不同摆放角和节距的光栅子准直器排列摆布,获得45个基于空间调制的傅立叶变换对,重建太阳耀斑源30–200 keV的硬X射线像,最高分辨率可达3.1′′.在光栅节距已经确定的前提下,它的摆放角分布仍会影响成像质量.通过对HXI仪器傅立叶分量μν分布与点扩散函数(PSF)的空间演化关系分析研究,寻求HXI光栅摆放角的最优分布.其结果将作为改进HXI仪器设计和开发相应科学分析软件的依据.

HXI(Hard X-ray Imager),one of the three main payloads of the ASO-S(Advanced Space-based Solar Observatory)satellite,is a Fourier-synthesis imager.It uses 91 sets of grid sub-collimators arranged at different angles and pitches to obtain45 space-modulated Fourier transform pairs,and to reconstruct the hard X-ray(30–200 keV)images of the solar flare sources,and the resolution can reach as high as 3.1′′.On the premise that grids pitch are determined,the arrangement of the grids can still affect the imaging quality.In this paper,the optimal distribution of the grid placement is obtained by analyzing the relationship between the instrument’sμνdistribution of the Fourier components and the corresponding evolution of the point spread function.This result will be used as the basis for improving HXI instrument design and developing scientific analysis software.