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Deformation verification and surface improvement of active stressed lap for 4 m-class primary mirror fabrication

机译:4 m级主镜制造中活动应力搭接的变形验证和表面改进

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摘要

The surface shape accuracy of the active stressed lap impacts the performance of grinding and polishing in the fabrication of large mirrors. We introduce a model of active stressed lap for the fabrication of a 4 m f/1.5 mirror based on finite element analysis (FEA), and the lap surface accuracy achieves RMS < 1.8 mu m in the FEA method. Using the lap surface measurement system, experimental verification is put forward, and the RMS of the measured lap surface is within 2 mu m in practice. A general improvement in lap surface accuracy using the Zernike polynomial is shown. After compensating the calculation errors, the lap surface accuracy is improved by 8%-23%, and achieves RMS < 1.5 mu m, which is appropriate for practical grinding and polishing. (C) 2015 Optical Society of America
机译:主动应力研磨的表面形状精度会影响大镜子制造中的研磨和抛光性能。我们基于有限元分析(FEA)引入了用于制造4 m f / 1.5反射镜的主动受压搭接模型,并且在FEA方法中,搭接表面精度达到RMS <1.8μm。使用棉卷表面测量系统进行了实验验证,实际测量的棉卷表面的均方根值在2微米以内。显示了使用Zernike多项式的搭接表面精度的总体提高。补偿了计算误差后,研磨表面的精度提高了8%-23%,达到RMS <1.5μm,适用于实际的研磨和抛光。 (C)2015年美国眼镜学会

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