Segmented mirrors are commonly used to construct large-aperture telescopes. We present a methodology for structural analysis and experimental results of an adjustment of a mm- to far-IR range (10 mm to 70 μm) segmented mirror panel to correct its deviation from an optimum paraboloid of rotation. The panel is made of high-modulus carbon fiber–reinforced plastic and has a shape of a 15-deg sector with a 1207 × 390 mm2 reflecting surface area. A system of mechanically operated adjusters for correcting large-scale surface deformations is described. We used our original method to correct fabrication errors and improved the surface shape accuracy from 23.8 to 4.5 μm (RMS values). The method is based on distance-to-target-surface minimization using vector influence functions and arbitrary movements. The results of the long-term panel shape stability monitoring and the effect of cooling the panel down to 77 K are also presented.

中文翻译：

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大口径望远镜用可调碳纤维增强塑料面板

分段反射镜通常用于构建大口径望远镜。我们提出了一种用于调整毫米到远红外范围（10 毫米到 70 微米）分段镜面板的结构分析和实验结果的方法，以校正其与最佳旋转抛物面的偏差。面板由高模量碳纤维增强塑料制成，呈 15 度扇形，反射表面积为 1207 × 390 mm2。描述了一种用于校正大规模表面变形的机械操作调节器系统。我们使用我们的原始方法来纠正制造错误，并将表面形状精度从 23.8 微米提高到 4.5 微米（RMS 值）。该方法基于使用矢量影响函数和任意运动的目标表面距离最小化。