光学极限下的望远镜阵列性能

Maj Steven M. Watson, J. Mills
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引用次数: 0

摘要

许多天体物理观测需要大直径的星载光学系统。由于进入轨道的空间和重量要求有限以及制造限制,大直径光学元件构成了一个问题。多孔径光学系统可能提供一种解决方案。该理论分析检查了许多多孔径系统(图1),并确定由19,37,61和91个孔径组成的多孔径系统可以提供脉冲响应(如图2所示),其优于相同直径的单个大光学系统。多孔径系统的二次叶辐照度最大值小于0.0175,比单大孔径系统的二次叶辐照度要好。在所有情况下,脉冲响应的中心瓣宽度等于等效直径的单个大孔径的中心瓣宽度。覆盖每个孔径中心部分的障碍物的增加(模拟卡塞格伦望远镜系统)导致19和19(旋转)孔径系统的二次瓣辐照度最大值进一步降低。图3显示了该分析的结果。对于遮挡和未遮挡的情况,19(旋转)孔径系统显示出最低的侧叶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Telescope Array Performance in the Optical Limit
Many astrophysical observations require large diameter space borne optics. Because of the limited space and weight requirements for boost into orbit and manufacturing limitations, large diamteter optics pose a problem. Multi-aperture optical systems may provide a solution. This theoretical analysis examined many multi-aperture systems (Figure 1) and determined that multi-aperture systems composed of 19, 37, 61, and 91 apertures could provide impulse responses (displayed in Figure 2) which were superior to that of a single large optic of an equivalent diameter. The multi-aperture systems were superior in the sense that the secondary lobe irradiance maxima of these systems was less than 0.0175, the secondary lobe irradiance of the single large aperture. In all cases, the central lobe widths of the impulse responses were equal to that of the single large aperture of equivalent diameter. The addition of obstructions which covered the central portion of each aperture (to simulate a Cassegrain telescope system) caused the secondary lobe irradiance maxima to be reduced further for the 19 and 19 (rotated) aperture systems. Figure 3 displays the results of this analysis. For obscured and unobscured cases, the 19 (rotated) aperture system exhibited the lowest side lobes.
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