| Solar imaging spectrometer in the extreme ultraviolet band is an important kind of instrument for solar observation. But traditional solar imaging spectrometer cannot observe the sun in a large field of view. Slitless imaging spectrometer allows imaging spectroscopy with high spatial and temporal resolution. Slitless imaging technique is a revolutionary technique for solar research in the extreme ultraviolet band.The main content of this thesis is the research of reconstruction algorithm of slitless imaging spectrometer. At first we introduce some algorithms which have been used successfully, then we propose some improved methods in this thesis. The main content of this thesis is as follows:1. We do a lot of research on algorithms which have been used successfully. As a direct correspondence exists between tomography and reconstruction of slitless imaging spectrometer, we do some research on some reconstruction algorithms in compute tomography. We also study a reconstruction algorithm which have been used in a slitless imaging spectrometer, but we find that there is a systematic error in the reconstruction result, which will affect the applicability of our instrument.2. We propose some improved methods to reduce this systematic error. We propose a parametric reconstruction algorithm, which do well in the reconstruction result but the algorithm is not robust. We think that sometimes robustness is more important than accuracy for an algorithm, so we propose an improved optical design to solve this problem. The reconstruction result of improved optical design shows more accurate than the old one with the same robustness.The research on solar imaging spectrometer in the extreme ultraviolet band is still in its infancy in China. The study of reconstruction algorithm in this thesis will provide the theoretical basis for the manufacture of our own solar slitless imaging spectrometer. |
