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Proceedings Paper

The design of an active support control system for a thin 1.2m primary mirror
Author(s): Rong Liu; Xiaojin Li; Haitao Liu; Hongqiao Wang
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Paper Abstract

Active support system is a low-frequency wavefront error correction system, which is often used to correct the mirror deformation resulting from gravity, temperature, wind load, manufacture, installation and other factors. In addition, the active support technology can improve the efficiency of grinding and polishing by adjusting the surface shape in the process of manufacturing large mirrors. This article describes the design of an active support control system for a thin 1.2m primary mirror. The support system consists of 37 axial pneumatic actuators. And in order to change the shape of thin primary mirror we need to precisely control the 37 pneumatic actuators. These 37 pneumatic actuators are divided into six regions. Each region is designed with a control circuit board to realize force closed-loop control for the pneumatic actuators, and all control panels are connected to the PC by CAN bus. The control panels have to support: receive commands from the host PC; control the actuators; periodically return result of control. The whole control system is composed by hardware and control algorithm and communication program.

Paper Details

Date Published: 2 September 2014
PDF: 6 pages
Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 92800X (2 September 2014); doi: 10.1117/12.2069830
Show Author Affiliations
Rong Liu, Institute of Optics and Electronics (China)
Univ. of Chinese Academy of Sciences (China)
Xiaojin Li, Institute of Optics and Electronics (China)
Haitao Liu, Institute of Optics and Electronics (China)
Univ. of Chinese Academy of Sciences (China)
Hongqiao Wang, Institute of Optics and Electronics (China)
Univ. of Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 9280:
7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Wenhan Jiang; Myung K. Cho; Fan Wu, Editor(s)

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