Research on Surface Measure Device for Process of Large Aperture Mirror Assembly

Haiping, 陈海平 Chen; Zhao, 熊召 Xiong; Tingfen, 曹庭分 Cao; Haixian, 叶海仙 Ye; Changchu, 刘长春 Liu; Xiaodong, 袁晓东 Yuan; Hai, 周海 Zhou

doi:10.3788/aos201636.0212002

Cited by 2 publications

(2 citation statements)

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“…The surface accuracy and structural stability of the mirror have a direct impact on beam positioning [3,4]. Currently, the clamping and support structures used for large aperture mirrors mainly include peripheral clamping, side clamping, and back support [5,6]. Scholars both domestically and internationally have conducted in-depth research on these structures and proposed a series of optimization methods.…”

Section: Introductionmentioning

confidence: 99%

Surface Analysis and Optimization of Large Aperture Mirror Supported by Elastic Expansion Sleeves

Zhang,

Fan

2024

J. Phys.: Conf. Ser.

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In order to meet the stability of the support structure of arrayed large aperture mirror and improve the surface accuracy of the mirror, the elastic expansion sleeve is proposed as the back-support structure of the large aperture mirror. The feasibility of the support method is verified by theoretical analysis and experiment. The PV value of additional wavefront distortion is about 75.3nm<λ/5(λ=632.8nm) when the torque of single mandrel screw is 40N·cm, which meets the technical specifications. The change trend of the support-induced surface is compared between the finite element simulation and the measured results under different mandrel screw torque conditions. When the support torque is increased in equal increments, there is a linear positive correlation between the PV value of support-induced surface and the support torque. Based on the change trend of the support-induced surface, the optimization design scheme of the initial surface is proposed. And the simulation results show that the optimized induced distortion is smaller than that of the ideal surface (the compensation ratio is 7.68%), which reduces the additional wavefront distortion under the actual mounting support.

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Section: Introductionmentioning

confidence: 99%

Surface Analysis and Optimization of Large Aperture Mirror Supported by Elastic Expansion Sleeves

Zhang,

Fan

2024

J. Phys.: Conf. Ser.

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“…Consequently, modern measurement methods of the antenna surface shape have seen continuous improvements. As shown in Table 1, commonly used surface shape detection methods mainly include the theodolite method, total station method, photogrammetry, laser tracking measurement, and radio holography (Chen et al 2016). The first three are optical methods that are primarily used for shape detection and calibration of overall panels before their installation.…”

Section: Introductionmentioning

confidence: 99%

Edge sensor based real-time calculation method for active panel position of QTT

Wang

Yan

et al. 2020

Res. Astron. Astrophys.

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QiTai Telescope (QTT), the world's biggest full-steerable telescope, will be constructed in Xinjiang, China. Its extra high operating frequency (115 GHz) imposes strict requirements on the accuracy of the reflector, while its large aperture (110 m) increases the impact of antenna weight and environment on surface accuracy. However, the panels of reflector will deform under the influence of gravity and the environment. Therefore, to compensate for the performance degradation caused by this deformation, a technique called active surface adjustment has been proposed. The existing adjustment methods cannot detect the deformation caused by environment of the reflector surface in real time, which can result in a delay in the compensation. Consequently, it is difficult to achieve an optimal compensating result. To solve this problem, a real-time method to estimate the large-aperture reflector antenna surface by calculating the antenna panel position based on edge sensors is proposed in this paper. In the proposed method, a panel coordinate transfer matrix has been formulated and the data measured from these edge sensors can then be treated as input for the proposed transfer matrix to calculate the actual position of the antenna panel in real time. A numerical simulation has been carried out in the QTT model and the results obtained show that the proposed real-time method is a promising tool to estimate the large reflector surface position in real time. It is believed that this active surface adjustment method has laid the foundation for new methods that will be developed to compensate for the reflector electrical performance.

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Research on Surface Measure Device for Process of Large Aperture Mirror Assembly

Cited by 2 publications

References 0 publications

Surface Analysis and Optimization of Large Aperture Mirror Supported by Elastic Expansion Sleeves

Surface Analysis and Optimization of Large Aperture Mirror Supported by Elastic Expansion Sleeves

Edge sensor based real-time calculation method for active panel position of QTT

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