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Proceedings Paper

Analysis of the measurement error of fibers' position for LAMOST
Author(s): Yi Jin; Chao Zhai; Yong Teng; Xiaozheng Xing
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Paper Abstract

In a fiber positioning system, geometrical coordinates of fibers need to be measured in order to verify the precision of fiber positioning. So a measurement system based on area CCD is built up. This system consists of an area CCD sensor, a frame grabber, a lens and a computer. Photogrammetric measurement has a high position detection precision for static objects and its measurement precision could be about 5 microns. Fibers are installed in the positioning units and can point to any point in the circular area with 33mm diameter. So not only temperature, vibration, lens aberration but also F number, lamp-house and speckle status will probably cause measuring error. Through lots of experiments, different factors which influence to fibers' position measurement precision are analyzed. From the experimental data of distances between fibers, whose actual values are unchangeable. It could be seen that measurement values of distances have a change at least 12 microns through Photogrammetric measurement when fibers rotate to different angles. Finally the measurement error is analyzed briefly.

Paper Details

Date Published: 27 November 2007
PDF: 9 pages
Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 672339 (27 November 2007); doi: 10.1117/12.783482
Show Author Affiliations
Yi Jin, Univ. of Science and Technology of China (China)
Chao Zhai, Univ. of Science and Technology of China (China)
Yong Teng, Univ. of Science and Technology of China (China)
Xiaozheng Xing, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 6723:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Junhua Pan; James C. Wyant; Hexin Wang, Editor(s)

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