27 November 2007 Analysis of the measurement error of fibers' position for LAMOST
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Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 672339 (2007) https://doi.org/10.1117/12.783482
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yi Jin, Yi Jin, Chao Zhai, Chao Zhai, Yong Teng, Yong Teng, Xiaozheng Xing, Xiaozheng Xing, } "Analysis of the measurement error of fibers' position for LAMOST", 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; https://doi.org/10.1117/12.783482
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