【摘要】 木卫一等离子体环是木星磁层中密度最大、研究最广泛的区域。为满足木卫一等离子体环的观测需求，设计了一种用于行星大气光谱望远镜（Planetary Atmospheric Spectral telescope,PAST）的Lyot星冕仪。根据木星的辐射特性与PAST参数确定仪器参数，给出Lyot星冕仪的初始结构并进行优化；分析了Lyot星冕仪的成像性能，系统在37 lp/mm的MTF>0.6，满足成像质量要求；确定系统杂散光成因，利用物像共轭关系设计相应的杂散光抑制结构，在千级超净间对Lyot星冕仪进行杂散光抑制水平检测。实验结果表明：系统主要杂散光得到了有效抑制，系统的杂散光抑制水平在2.5Rj处为10-5量级，满足地基观测木卫一等离子体环要求。更多还原

【Abstract】 The Io plasma torus is the most densest and most widely studied region of Jupiter′s magnetosphere. To meet observe the Io plasma torus observation,a Lyot Coronagraph was installed in the planet′s atmosphere spectrum telescope to meet the needs of imaging observation of Io plasma torus capture the emissive spectrum. The parameters of the instrument were determined according to the radiation characteristics of the Jupiter and the parameters of PAST. Then,the initial structure was optimized. The imaging performance of the system was analyzed,and the MTF value at37 lp/mm is above 0. 6 that meet the design specification. Considering the character of stray light in system,a structure system for suppressing stray light was built considering the characteristics of stray light. The level of stray light in the system was measured in a class 1 000 cleanroom. The experimental results show that the main sources of stray light can be suppressed entirely,and the stray light suppression level of the system is equal to 10-5at 2. 5Rj,which satisfies the system requirements for observing Io plasma torus.更多还原