相移望远镜干涉仪的概念设计
Conceptual design of a phase shifting telescope-interferometer
摘要：
本文论述了移相望远镜干涉仪的理论原理和光学设计。望远镜干涉仪（Telescope-Interferometer，T-I）是一种新型的波前误差（WFE）检测技术，其基本思想是将望远镜的主光瞳与第二个离轴参考臂相结合，然后在焦平面上产生一个弱调制的点扩散函数（PSF），从而实现直接相位测量。我们提出了一个显着的改进的方法，从相移干涉术的经典原理的启发。本文介绍了这种替代方法的原理及其可达到的测量精度。该技术显示出高性能，除了位于瞳孔边界附近的狭窄区域。它既适用于地面望远镜，也适用于空间望远镜，并适合于分段镜的同相，这对于未来的巨型望远镜项目至关重要。
英文摘要：
This paper deals with the theoretical principle and optical design of a phase-shifting telescope-interferometer. What is called a "Telescope-Interferometer" (T-I) is indeed a novel, recently proposed Wavefront Error (WFE) sensing technique, whose basic idea consists in combining the main pupil of a telescope with a second, off-axis reference arm. Then a weak modulation of the Point Spread Function (PSF) is generated at the focal plane, allowing for direct phase measurements. We propose a notable improvement of the method, inspired from classical principles of phase shifting interferometry. Herein are presented the alternative principle and its achievable measurement accuracy. The technique shows high performance excepted on narrow areas located near the pupil boundary. It is applicable to both ground or space telescopes and is suitable for the co-phasing of segmented mirrors, which is of prime importance in view of future giant telescope projects.
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