Active compensation of aberration for large ground-based telescope based on Hexapod platform

doi:10.37188/OPE.20202811.2452

CIOMP OpenIR

	Active compensation of aberration for large ground-based telescope based on Hexapod platform
	Y.-Y. Cao, J.-L. Wang, T. Chen, T.-Y. Lu, H.-H. Wang, Y. Zhang and F.-G. Wang
	2020
发表期刊	Guangxue Jingmi Gongcheng/Optics and Precision Engineering
ISSN	1004924X
卷号	28 期号:11 页码:2452-2465
摘要	As the diameter of a ground-based telescope increases, the image quality will significantly degrade because of optical misalignment, which is caused by gravity and thermal deformations of the telescope structure. To accurately estimate the misalignment error, a mechanical model of a telescope was established, and the computation method and compensation process were investigated. According the structural components of the telescope, the structural model was simplified, and then the mechanical model was established using the finite element method. Based on nonlinear least square fitting, a method was presented to compute the misalignment error between the primary and secondary mirrors in which the inputs were the current node position of the primary and secondary mirror surfaces. Thereafter, a method in which the optical axis of the primary mirror used as the benchmark were adopted to determine the length of the hexapod leg with the objective of compensating for the misalignment error. Finally, numerical examples of a ground-based telescope with a diameter of 2 m were presented to verify the presented methods and the corresponding theories. The simulation results show that there are obvious misalignment errors because of gravity and thermal deformations, with maximum root mean square (RMS) radii of the optical spots being 1 473 and 557 m, respectively. After the secondary mirror compensation, the RMS radii of the spots are decreased significantly, with all of them being 2020, Science Press. All right reserved.
DOI	10.37188/OPE.20202811.2452
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收录类别	EI
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64284
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Y.-Y. Cao, J.-L. Wang, T. Chen, T.-Y. Lu, H.-H. Wang, Y. Zhang and F.-G. Wang. Active compensation of aberration for large ground-based telescope based on Hexapod platform[J]. Guangxue Jingmi Gongcheng/Optics and Precision Engineering,2020,28(11):2452-2465.
APA	Y.-Y. Cao, J.-L. Wang, T. Chen, T.-Y. Lu, H.-H. Wang, Y. Zhang and F.-G. Wang.(2020).Active compensation of aberration for large ground-based telescope based on Hexapod platform.Guangxue Jingmi Gongcheng/Optics and Precision Engineering,28(11),2452-2465.
MLA	Y.-Y. Cao, J.-L. Wang, T. Chen, T.-Y. Lu, H.-H. Wang, Y. Zhang and F.-G. Wang."Active compensation of aberration for large ground-based telescope based on Hexapod platform".Guangxue Jingmi Gongcheng/Optics and Precision Engineering 28.11(2020):2452-2465.

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