Gonté Frédéric, Dupuy Christophe, Luong Bruno, Frank Christoph, Brast Roland, Sedghi Baback
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany.
Appl Opt. 2009 Nov 10;48(32):6392-9. doi: 10.1364/AO.48.006392.
The primary mirror of the future European Extremely Large Telescope will be equipped with 984 hexagonal segments. The alignment of the segments in piston, tip, and tilt within a few nanometers requires an optical phasing sensor. A test bench has been designed to study four different optical phasing sensor technologies. The core element of the test bench is an active segmented mirror composed of 61 flat hexagonal segments with a size of 17 mm side to side. Each of them can be controlled in piston, tip, and tilt by three piezoactuators with a precision better than 1 nm. The context of this development, the requirements, the design, and the integration of this system are explained. The first results on the final precision obtained in closed-loop control are also presented.
未来的欧洲极大望远镜的主镜将配备984个六边形镜片。要将这些镜片在活塞、倾斜和俯仰方向上对准至几纳米的精度，需要一个光学相位传感器。现已设计了一个试验台来研究四种不同的光学相位传感器技术。试验台的核心元件是一个有源分段镜，它由61个扁平的六边形镜片组成，每个镜片的边长为17毫米。每个镜片可通过三个压电致动器在活塞、倾斜和俯仰方向上进行控制，精度优于1纳米。本文解释了该系统的研发背景、要求、设计和集成情况。还展示了闭环控制中最终获得的精度的初步结果。
