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Proceedings Paper

Control and network system of force actuators for deformable mirror active optics in LAMOST
Author(s): Shengtao Zhang; Zhenchao Zhang; You Wang
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Paper Abstract

The reflecting Schmidt plate MA of LAMOST consists of 24 segmented hexagonal sub-mirrors. Each sub-mirror is 25mm thick and 1.1m in diagonal. There are 34 force actuators on the back of one sub-mirror which need to be controlled to offer precise load to create correct mirror deformation. This paper presents the control method and network configuration of force actuators for one sub-mirror. Master computer running Windows NT operation system and slave controllers running DOS operation system are connected together via Ethernet local area network (ELAN) by means of TCP/IP protocol. Adopting five slave controllers, 34 force actuators are combined into a distributed system. Master computer controls five slave controllers and five slave controllers operate 34 force actuators. Master computer communicates with slave controllers normally, which receives state of each force actuator from slave controllers and sends instructions to slave controllers via Ethernet LAN. Each slave controller operates 8 force actuators to offer correct load. Axial load capacity of force actuator is ±150N (pull and push) with accuracy RMS ≤0.05N. Force sensor is used as close-loop feedback apparatus to detect the micro load of the actuator.

Paper Details

Date Published: 21 November 2007
PDF: 8 pages
Proc. SPIE 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 67210N (21 November 2007); doi: 10.1117/12.782944
Show Author Affiliations
Shengtao Zhang, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)
Graduate School of the Chinese Academy of Sciences (China)
Zhenchao Zhang, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)
You Wang, National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology (China)


Published in SPIE Proceedings Vol. 6721:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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