On the effects of spider-arms vignetting on interferometric measurements of deformable mirrors

IF 1.7 3区工程技术 Q2 ENGINEERING, AEROSPACE

Journal of Astronomical Telescopes Instruments and Systems Pub Date : 2023-04-01 DOI:10.1117/1.JATIS.9.2.029002

R. Briguglio, G. Pariani, M. Xompero, Nicolò Azzaroli, C. Selmi, A. Riccardi, L. Oggioni

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Abstract

Abstract. The interferometric calibration and measurement of deformable mirrors for adaptive optics are often performed on complex optical system with spider arms. The spider shadows may divide the mirror surface into separate islands on the detector, so the interferometer fails in reconnecting them to a common phase value. The calibration measurements then suffer from such artificial differential pistons across islands, which is converted into a wrong actuator command and in general into a poor calibration. We review the effects of spider arms shadowing as experienced during the optical calibration of large format adaptive mirrors, such as the Large Binocular Telescope and Very Large Telescope ones; we describe the procedures that we tested to cope with these issues and their effectiveness; and we present a laboratory assessment of the effect of such a shadowing with a dedicated test setup. Our work is part of a preparatory activity for the optical test of the European Extremely Large Telescope adaptive mirror M4.

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蜘蛛臂渐晕对变形镜干涉测量的影响

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本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Astronomical Telescopes Instruments and Systems Engineering-Mechanical Engineering

CiteScore

4.40

自引率

13.00%

发文量

119

期刊介绍： The Journal of Astronomical Telescopes, Instruments, and Systems publishes peer-reviewed papers reporting on original research in the development, testing, and application of telescopes, instrumentation, techniques, and systems for ground- and space-based astronomy.