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恒星干涉仪作为波前传感器的分析

An analysis of stellar interferometers as wavefront sensors

Francois Henault

摘要:

本文介绍了一种新的方法的基本原理和理论关系,该方法可以用来恢复地面或空间望远镜在主光瞳与第二偏心参考光臂结合时的波前误差(WFE)。然后,通过各种数值模拟,估计了这种“望远镜-干涉仪”的测量精度。除了在望远镜光瞳边缘附近的有限区域之外,显示出高性能。特别是,它允许直接相位评估(从而避免使用一阶或二阶导数),这对于未来巨型望远镜项目中分段镜的共相位特别感兴趣。最后,我们定义了有用的实用域的方法,这似乎是更好地适合于定期诊断的空间或地面的望远镜,或实时的科学观测,在一些非常特殊的情况下(例如,在太阳系外行星搜索仪器的中心恒星)。

英文摘要:

This paper presents the basic principle and theoretical relationships of an original method allowing to retrieve the Wavefront Errors (WFE) of a ground or space-borne telescope when combining its main pupil with a second, decentered reference optical arm. The measurement accuracy of such a "telescope-interferometer" is then estimated by means of various numerical simulations, demonstrating a high performance excepted on limited areas near the telescope pupil rim. In particular, it allows direct phase evaluation (thus avoiding the use of first or second-order derivatives), which is of special interest for the co-phasing of segmented mirrors in future giant telescopes projects. We finally define the useful practical domain of the method, which seems to be better suited for periodical diagnostics of space or ground based telescopes, or to real-time scientific observations in some very specific cases (e.g. the central star in extrasolar planets searching instruments).

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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