The design of an active support control system for a thin 1.2m primary mirror

Rong Liu; Xiaojin Li; Haitao Liu; Hongqiao Wang

doi:10.1117/12.2069830

2 September 2014 The design of an active support control system for a thin 1.2m primary mirror

Rong Liu, Xiaojin Li, Haitao Liu, Hongqiao Wang

Proceedings Volume 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 92800X (2014) https://doi.org/10.1117/12.2069830
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

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.

Citation Download Citation

Rong Liu, Xiaojin Li, Haitao Liu, and Hongqiao Wang "The design of an active support control system for a thin 1.2m primary mirror", Proc. SPIE 9280, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 92800X (2 September 2014); https://doi.org/10.1117/12.2069830

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KEYWORDS

Actuators

Control systems

Mirrors

Control systems design

Digital signal processing

Interfaces

Sensors

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