Unimorph mirror for adaptive optics in space telescopes

Alaluf David; Bastaits Renaud; Wang Kainan; Horodinca Mihaita; Martic Gregory; Mokrani Bilal; Preumont Andre

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Unimorph mirror for adaptive optics in space telescopes

机译：用于空间望远镜的自适应光学的单身镜子

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This paper presents a unimorph deformable mirror intended to be used as secondary corrector in space telescopes. The deformable mirror consists of a single-crystal silicon wafer (76.2 mm diameter, 500 mu m thickness) covered with an optical coating on the front side and an array of 25 independent piezoelectric transducer (PZT) actuators acting in d(31) mode on the back side. The mirror is mounted on an isostatic support with three position linear actuators controlling the rigid-body motion. The first part of the paper presents the experimental results obtained with the manufactured prototype. The mirror was tested in terms of root mean square (RMS) wavefront error, open-loop long-term stability, voltage budget for active control, rigid-body actuation, reflectivity, and dynamic response. The prototype is fully compliant with the requirements set by the European Space Agency (ESA). The second part of the paper, purely based on numerical simulations, presents a robust way to face thermal distortion, inherent to unimorph architecture. (C) 2018 Optical Society of America.

机译：本文介绍了一个单身可变形镜，旨在用作太空望远镜中的次级校正器。可变形镜包括在前侧上覆盖的单晶硅晶片（直径，500μm厚度，500μm厚度），以及在D（31）模式下作用的25个独立压电换能器（PZT）致动器阵列的阵列背面。用三个位置线性致动器安装在等静压支撑件上，控制刚体运动。本文的第一部分呈现了用制造的原型获得的实验结果。镜子在均方根（RMS）波前误差，开环长期稳定性，电压预算方面进行了测试，用于主动控制，刚体致动，反射率和动态响应。原型完全符合欧洲航天局（ESA）设定的要求。纸张的第二部分，纯粹基于数值模拟，呈现了一种稳健的方式来面对热失真，固有的无人物架构。（c）2018年光学学会。

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来源
《Applied optics》 |2018年第14期|共10页
作者
Alaluf David; Bastaits Renaud; Wang Kainan; Horodinca Mihaita; Martic Gregory; Mokrani Bilal; Preumont Andre;
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作者单位

Univ Libre Bruxelles Dept Control Engn &

Syst Anal Act Struct Lab Brussels Belgium;

Univ Libre Bruxelles Dept Control Engn &

Syst Anal Act Struct Lab Brussels Belgium;

Univ Libre Bruxelles Dept Control Engn &

Syst Anal Act Struct Lab Brussels Belgium;

Tech Univ Gheorghe Asachi Dept Machine Tools &

Tools Iasi Romania;

Belgian Ceram Res Ctr Mons Belgium;

Univ Liverpool Dept Mech Mat &

Aerosp Engn Brownlow Hill Liverpool L69 3GH Merseyside England;

Univ Libre Bruxelles Dept Control Engn &

Syst Anal Act Struct Lab Brussels Belgium;

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Unimorph mirror for adaptive optics in space telescopes

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