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首页> 外文会议>Conference on Optical Design and Engineering; Sep 30-Oct 3, 2003; St.Etienne, France >MAGRITTE Optomechanical Design and Mirror Manufacturing
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MAGRITTE Optomechanical Design and Mirror Manufacturing

机译：MAGRITTE光学机械设计和反射镜制造

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摘要

The MAGRITTE telescopes are part of the SHARPP instrument suite, part of the Solar Dynamics Observatory (SDO), a NASA spacecraft to be launched in a geostationnary orbit in 2007. The MAGRITTE instrument package will provide high resolution images of the solar corona at high temporal frequency simultaneously in 5 EUV and in Ly-a narrow bandpasses. The 1.4 R_0 MAGRITTE common field of view compliments the other SHARPP instruments, as well as its spectral coverage with 6 narrow bandpasses located within the 19.5 to 120 nm interval. The key challenges of the MAGRITTE instrument are a high angular resolution (0.66 arcsec/pixel) with a high responsivity (exposure times smaller than 8 sec), combined with restricted spacecraft resources. The design of MAGRITTE is based on a high performance off-axis Ritchey-Chretien optical system combined with a large detector (4 K x 4 K, 12 μm pixel). The tight pointing stability performance of 1.2 arcsec over the image exposure time requires an active image motion control, using pointing information of a Guide Telescope, to compensate low frequency boresight variations produced by spacecraft jitter. The thermomechanical design and the mirror polishing are highly critical issues in the instrument design. This paper presents the MAGRITTE design concept with the expected performances based on a realistic error budget. The mirror polishing concept and performances are discussed.
机译：MAGRITTE望远镜是SHARPP仪器套件的一部分，它是太阳动力学天文台（SDO）的一部分，SDO是将于2007年在对地静止轨道发射的NASA航天器。MAGRITTE仪器套件将提供高时间太阳日冕的高分辨率图像在5 EUV和Ly-a窄带通中同时频率。 1.4 R_0 MAGRITTE通用视场对其他SHARPP仪器及其在19.5至120 nm间隔内的6个窄带通的光谱覆盖范围构成了补充。 MAGRITTE仪器的主要挑战是具有高响应速度（曝光时间小于8秒）的高角分辨率（0.66弧秒/像素），以及有限的航天器资源。 MAGRITTE的设计基于高性能离轴Ritchey-Chretien光学系统和大型检测器（4 K x 4 K，12μm像素）。在图像曝光时间内要达到1.2弧秒的严格指向稳定性能，需要使用引导望远镜的指向信息进行主动的图像运动控制，以补偿由航天器抖动产生的低频视轴变化。热机械设计和镜面抛光是仪器设计中非常关键的问题。本文提出了基于实际误差预算的MAGRITTE设计概念以及预期的性能。讨论了镜面抛光的概念和性能。

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