Overview of Active Support Technology for Main Mirror of Segmented Telescopes

Wu Songhang; Dong Jihong; Xu Shuyan; Xu Boqian

doi:10.3788/LOP202158.0300006

Journals >Laser & Optoelectronics Progress >Volume 58 >Issue 3 >Page 3000061 > Article

Laser & Optoelectronics Progress
Vol. 58, Issue 3, 3000061 (2021)

Overview of Active Support Technology for Main Mirror of Segmented Telescopes

Wu Songhang^1、2, Dong Jihong¹, Xu Shuyan¹, and Xu Boqian¹

Author Affiliations

¹Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun , Jilin 130033, China

²University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/LOP202158.0300006 Cite this Article Set citation alerts

Wu Songhang, Dong Jihong, Xu Shuyan, Xu Boqian. Overview of Active Support Technology for Main Mirror of Segmented Telescopes[J]. Laser & Optoelectronics Progress, 2021, 58(3): 3000061 Copy Citation Text

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Abstract

Segmented telescopes are among the expected future directions of large-diameter telescopes owing to the low difficulty of their processing technology， convenient carrying， and low manufacturing cost. The active support technology provides an important guarantee for the confocal and cophase adjustment of segmented telescopes. This study briefly summarizes the main technologies of the active support system for the main mirror of a segmented telescope and then summarizes and analyzes specific application examples. Finally， it provides design suggestions for the main mirror support system of a segmented telescope. It will provide a valuable reference for the future development of the segmented telescope support technology.

Keywords

active support actuator optical devices segmented telescope

T = [\begin{matrix} c o s β c o s γ & c o s γ s i n α s i n β - s i n γ c o s α & s i n α s i n γ + c o s α s i n β c o s γ & x_{p} \\ c o s β s i n γ & c o s α c o s γ + s i n α s i n β s i n γ & s i n β s i n γ c o s α - c o s γ s i n α & y_{p} \\ - s i n β & s i n α c o s β & c o s α c o s β & z_{p} \\ 0 & 0 & 0 & 1 \end{matrix}]

，（1）

P_{i} = T P_{0}

，（2）

P_{i} + O_{L} = B_{i} + l_{i} n_{i}

，（3）

l_{i} = \sqrt[]{{(P_{i} + O_{L} - B_{i})}^{T} (P_{i} + O_{L} - B_{i})}

。（4）

w (x, y) = \sum_{i = 1}^{n} F_{i} w_{i} (x, y)

。（5）

C f = - w_{e r r o r}

。（6）

[\begin{matrix} \frac{\partial z_{1}}{\partial f_{1}} & \dots & \frac{\partial z_{1}}{\partial f_{n}} \\ ⋮ & ⋮ \\ \frac{\partial z_{m}}{\partial f_{1}} & \dots & \frac{\partial z_{m}}{\partial f_{n}} \end{matrix}] \times [\begin{matrix} F_{1} \\ ⋮ \\ F_{n} \end{matrix}] = [\begin{matrix} z_{1} \\ ⋮ \\ z_{m} \end{matrix}]

（7）

f = - (C^{T} {C)}^{- 1} C^{T} w_{e r r o r}

（8）

Δ P = A^{- 1} Δ Z

，（9）

Wu Songhang, Dong Jihong, Xu Shuyan, Xu Boqian. Overview of Active Support Technology for Main Mirror of Segmented Telescopes[J]. Laser & Optoelectronics Progress, 2021, 58(3): 3000061

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