Precision Positioning Methods And Institutions Of The Multi-fiber Research

In the LAMOST(Large Area Multi-Object Fiber Spectroscope Telescope) project, 4000 optical fibers are mounted on its focal plane which diameter is 1. 75m.The positioning precision less than 40 microns, and positioning time less than 30 minutes. The paper analyzed the typical method of positioning of optical fiber in astronomic observation. According to the structure's characteristics and the working demands of LAMOST , bring forward the new plan on positioning of optical fiber that the focal plane is divided up many unit zones. The device turns round at the range of 360 ,and locomotive block moves in linear guide in every unit zone. So optical fiber can arrive everywhere in focal plane .Experiment result elucidation:the standard deviation of repeat error and positioning error less than 40 microns, the positioning precision of this system can reach demand.