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Analyzing the impact of vibrations on E-ELT primary segmented mirror

机译：分析振动对E-ELT主分段镜的影响

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The E-ELT primary mirror is 39m in diameter composed of 798 segments. It is exposed to external large but slow amplitude perturbations, mostly gravity, thermal and wind. These perturbations are efficiently rejected by a combination of edge sensor loop and adaptive optics (AO) in order to leave a small residual wavefront error (WFE). Vibrations induced by various equipment in the observatory are typically smaller amplitude but higher frequency perturbations exceeding the rejection capabilities of these control loops. They generate both, low spatial frequency and high spatial frequency WFE. Especially segment phasing errors, i.e. high spatial frequency errors, cannot be compensated by AO. The effect of vibrations is characterized by excitation sources and transmission of the telescope structure and segment support. They all together define the WFE caused by Ml due to vibrations. It is important to build a proper vibration error budget and specification requirements from an early stage of the project. This paper presents the vibration analysis and budgeting approach developed for E-ELT Ml and addresses the impact of vibrations onto WFE.
机译：E-ELT主镜的直径为39m，由798个分段组成。它受到外部较大但缓慢的振幅扰动的影响，主要是重力，热和风。边缘传感器环路和自适应光学器件（AO）的组合有效地消除了这些干扰，从而留下很小的残留波前误差（WFE）。由天文台的各种设备引起的振动通常幅度较小，但较高的频率扰动超出了这些控制回路的抑制能力。它们生成低空间频率和高空间频率WFE。尤其是分段相位误差，即高空间频率误差，不能由AO补偿。振动的影响的特征在于激发源以及望远镜结构和分段支撑的传输。它们一起定义了由于振动而由M1引起的WFE。从项目的早期阶段就建立适当的振动误差预算和规格要求非常重要。本文介绍了为E-ELT M1开发的振动分析和预算方法，并论述了振动对WFE的影响。

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