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Proceedings Paper

Decoupling control for position error and surface error of segmented primary mirror
Author(s): Bing Dong; Xin Yu; Xiaofang Zhang; Xiao Wang
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Paper Abstract

Large-aperture segmented primary mirror has been widely used in high-resolution space telescopes. After deployment, position error and surface error of each segmented mirror will lead inacceptable wavefront errors together. A critical problem is how to decouple position error and surface error from exit-pupil wavefront aberrations. We proposed a decoupling control strategy based on sensitivity matrix retrieval method. The sensitivity matrix of segmented mirror is calculated by simulation method and a new type of orthogonal polynomials is recommended to fit wavefront aberrations in non-circular area. First we give a simulation example to show how to decouple position errors in each degree of freedom if there are no surface errors. Then a further simulation reveals the decoupling control process for position and surface errors. The low order aberrations are corrected by position control actuators and high order aberrations are corrected by figure control actuators.

Paper Details

Date Published: 6 May 2009
PDF: 6 pages
Proc. SPIE 7281, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 72810C (6 May 2009); doi: 10.1117/12.831436
Show Author Affiliations
Bing Dong, Beijing Institute of Technology (China)
Xin Yu, Beijing Institute of Technology (China)
Xiaofang Zhang, Beijing Institute of Technology (China)
Xiao Wang, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 7281:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Roland Geyl; Myung K. Cho; Fan Wu, Editor(s)

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