Low-order aberration correction of the TMT tertiary mirror prototype based on a warping harness

Han Linchu; Liu Chengzhi; Fan Cunbo; Li Zhenwei; Zhang Jingxu; Yin Xiaolin

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Low-order aberration correction of the TMT tertiary mirror prototype based on a warping harness

机译：基于翘曲线束的TMT三级镜原型的低阶像差校正

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A warping harness is proposed to simply and efficiently correct low-order aberrations that occur during manufacturing and operation of a telescope. For the Thirty Meter Telescope (TMT) tertiary mirror, the issue to be solved by the warping harness is particularly challenging due to its complicated load conditions and limited mounting space. In this study, first, a new type of whiffletree-based warping harness configuration applied to a 1/4 -prototype TMT tertiary mirror is presented and optimized using finite element analysis (FEA) to improve the output precision of the moment actuator. Next, based on the new configuration, a simulation method for a correction process is proposed. The results show that the root mean square value of the mirror-surface error converged from 64.9 to 25.4 nm after correction, which satisfied the requirement document of TMT. Finally, combined with the analysis and calculation results, the moment actuator testing system with high-precision displacement-force-strain is established to assess the system errors. The tests of the moment actuator displacement, stress, strain-output precision, linearity, and repeatability are completed, and all errors were found to be within a controllable range. The results show the validity and feasibility of the designed warping harness, which can prove its applicability in more complicated conditions and, to a certain degree, broaden the application scope of the warping harness. (C) 2018 Optical Society of America

机译：建议翘曲的线束简单有效地校正在望远镜的制造和操作期间发生的低阶像差。对于三十米望远镜（TMT）三级镜子，由于其复杂的负载条件和有限的安装空间，翘曲线束解决的问题特别具有挑战性。在本研究中，首先，使用有限元分析（FEA）来提出和优化应用于1/4的基于Whottotyp的翘曲线束配置的新型Whifflee的翘曲线束配置，以提高力矩执行器的输出精度。接下来，基于新配置，提出了一种校正过程的模拟方法。结果表明，校正后镜面误差的根均方值从64.9到25.4nm收敛，这满足了TMT的要求文件。最后，结合分析和计算结果，建立了具有高精度位移力 - 应变的力矩执行器测试系统，以评估系统误差。完成时刻执行器位移，应力，应变 - 输出精度，线性度和可重复性的测试，并且发现所有错误都在可控范围内。结果表明，设计的翘曲线束的有效性和可行性，可以在更复杂的条件下证明其适用性，并在一定程度上扩大翘曲线束的应用范围。（c）2018年光学学会

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来源
《Applied optics》 |2018年第7期|共9页
作者
Han Linchu; Liu Chengzhi; Fan Cunbo; Li Zhenwei; Zhang Jingxu; Yin Xiaolin;
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Chinese Acad Sci Natl Astron Observ Changchun Observ Changchun 130117 Jilin Peoples R China;

Chinese Acad Sci Natl Astron Observ Changchun Observ Changchun 130117 Jilin Peoples R China;

Chinese Acad Sci Natl Astron Observ Changchun Observ Changchun 130117 Jilin Peoples R China;

Chinese Acad Sci Natl Astron Observ Changchun Observ Changchun 130117 Jilin Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys Changchun 130033 Jilin Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys Changchun 130033 Jilin Peoples R China;

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正文语种 eng
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Low-order aberration correction of the TMT tertiary mirror prototype based on a warping harness

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