High contrast imaging with MEMS deformable mirrors in the Decadal Survey Testbed
High contrast imaging with MEMS deformable mirrors in the Decadal Survey Testbed
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在十年测量测试台中使用 MEMS 可变形镜进行高对比度成像
DOI：
10.1117/12.2593459
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Byoung
中科院分区：
文献类型：
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作者：
A. Riggs;G. Ruane;Camilo Mejia Prada;D. Marx;Byoung
可变形镜（dm）是任何日冕高对比度仪器的重要组成部分。它们减轻了系统中的光学像差，甚至可以用来为日冕仪产生对比度。波士顿微机公司的MEMS DMs已被选为2020年十年调查中提出的两个旗舰空间望远镜的基线。尽管MEMS DMs在地面望远镜和全球空气试验台上已有十多年的历史，但它们还没有在真空中测试到成像类地系外行星所需的~ 10−10对比度水平。本文介绍了在喷气推进实验室的年代际测量试验台上对MEMS DMs进行的真空试验。第一个挑战是一个明亮的、暂时不相干的信号，它被识别为电子噪声，并用低通滤波器去除。在此之后，由于DM表面上的强穿透性，对比度在宽带光下受到限制。我们进行了数值模拟来证实这一结论，并表征了MEMS DM表面和试验台布局所需的改进，以达到10−10对比度的目标。关键词：变形镜；日冕仪
Deformable mirrors (DMs) are an essential part of any coronagraphic, high contrast instrument. They mitigate optical aberrations in the system and can even be used to generate contrast for the coronagraph. MEMS DMs from Boston Micromachines have been selected as the baseline for two flagship space telescopes proposed to the 2020 Decadal Survey. Although MEMS DMs have over a decade of heritage on ground-based telescopes and in in-air testbeds around the globe, they have not been tested in vacuum down to the ∼10−10 contrast level needed to image terrestrial exoplanets. In this paper, we describe vacuum tests of MEMS DMs in the Decadal Survey Testbed at the Jet Propulsion Laboratory. The first challenge was a bright, temporally incoherent signal, which was identified as electronics noise and removed with a low-pass filter. After that, the contrast has been limited in broadband light by the strong print-through on the DM surfaces. We performed numerical simulations to confirm that conclusion and to characterize the improvements needed to the MEMS DM surfaces and the testbed layout to attain our goal of 10−10 contrast. Keywords: deformable mirror, coronagraph