Design issues for a 30-m highly segmented mirror are explored, with emphasis on parametric models of simple, inexpensive segments. A mirror with many small segments offers cost savings through quantity production and permits high-order active and adaptive wave-front corrections. For a 30-m f/1.5 paraboloidal mirror made of spherical, hexagonal glass segments, with simple warping harnesses and three-point supports, the maximum segment diameter is similar to100 mm, and the minimum segment thickness is similar to5 mm. Large-amplitude, low-order gravitational deformations in the mirror cell can be compensated if the segments are mounted on a plate floating on astatic supports. Because gravitational deformations in the plate are small, the segment actuators require a stroke of only a few tens of micrometers, and the segment positions can be measured by a wave-front sensor. (C) 2003 Optical Society of America. [References: 31]
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机译:探讨了30米高分段镜的设计问题,重点是简单,廉价分段的参数模型。具有许多小段的反射镜可通过批量生产节省成本,并允许进行高阶有源和自适应波阵面校正。对于由球形六边形玻璃片段制成的30 m f / 1.5抛物面反射镜,具有简单的翘曲线束和三点支撑,其最大片段直径近似于100 mm,最小片段厚度近似于5 mm。如果将节段安装在浮动支架上,则可以补偿反射镜单元中的大幅度,低阶重力变形。由于板中的重力变形很小,因此段致动器仅需要几十微米的行程,并且段位置可以通过波前传感器进行测量。 (C)2003年美国眼镜学会。 [参考:31]
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