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arXiv 1709.02672astro-ph.IM
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移相电晕放电

Phase-shifting coronagraph

François Hénault, Alexis Carlotti, Christophe Vérinaud

摘要:

随着SPHERE或GPI等地面仪器以及WFIRST-AFTA等未来空间观测站的投入使用,日冕仪可能会成为未来几年识别和表征太阳系外行星的最有效工具。日冕仪,如相位掩模日冕仪(PMC)通常是基于一个相位掩模或板位于望远镜焦平面,传播的星光直径以外的Lyot停止,阻止it. In这个通信的PMC的能力进行调查,作为一个相移波前传感器,以更好地控制所实现的恒星消光比在日冕掩模的存在。我们讨论了相移过程的两种主要实现方式,要么在光瞳平面中引入相移并感测图像平面中的强度变化,要么在光瞳平面中引入相移。在这两种情况下描述的概念光学设计。数值模拟可以更好地了解这两种选择的性能和局限性,并优化其基本参数。特别是,他们证明,相移过程是一个更有效的实施时,到一个图像平面,是目前采用的最流行的相位掩模,即四象限和涡流相位掩模兼容。

英文摘要:

With the recent commissioning of ground instruments such as SPHERE or GPI and future space observatories like WFIRST-AFTA, coronagraphy should probably become the most efficient tool for identifying and characterizing extra-solar planets in the forthcoming years. Coronagraphic instruments such as Phase mask coronagraphs (PMC) are usually based on a phase mask or plate located at the telescope focal plane, spreading the starlight outside the diameter of a Lyot stop that blocks it. In this communication is investigated the capability of a PMC to act as a phase-shifting wavefront sensor for better control of the achieved star extinction ratio in presence of the coronagraphic mask. We discuss the two main implementations of the phase-shifting process, either introducing phase-shifts in a pupil plane and sensing intensity variations in an image plane, or reciprocally. Conceptual optical designs are described in both cases. Numerical simulations allow for better understanding of the performance and limitations of both options, and optimizing their fundamental parameters. In particular, they demonstrate that the phase-shifting process is a bit more efficient when implemented into an image plane, and is compatible with the most popular phase masks currently employed, i.e. four-quadrants and vortex phase masks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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