The measurement system for fiber positioning unit of LAMOST

Weimin Li; Xiaozheng Xing; Jin Yi; Hongzhuan Hu; Chao Zhai; Qiaoyun Yu

doi:10.1117/12.550880

30 September 2004 The measurement system for fiber positioning unit of LAMOST

Weimin Li, Xiaozheng Xing, Jin Yi, Hongzhuan Hu, Chao Zhai, Qiaoyun Yu

Proceedings Volume 5492, Ground-based Instrumentation for Astronomy; (2004) https://doi.org/10.1117/12.550880
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The paper proposes the measurement system for the fiber positioning unit of LAMOST(Large Sky Area of Multi-Object Fiber Spectroscope Telescope). It consists of an area CCD sensor, an image acquisition card, and a lens. The fiber is illuminated by light source from one end. The end of the fiber on the focal plate is imaged on the area CCD sensor by the lens. The image of the fiber end is acquired by the area CCD sensor, and transferred into a computer by the image grabber. Some pro-processed methods are used to process the digital image of the fiber. According to further digital image processing, the position of the fiber is obtained. The paper focuses on the calibration method of the digital area CCD camera. The measurement system calibrates the camera with the calibration board. The calibration board has some holes illuminated by an area LED. The positions of those holes are pre-measured precisely. Then, the systematic error of the measurement is figured out through the calibration procession. The optical aberration is fitted by the quartic surface. The measurement system can measure the position of the fiber on the positioning unit precisely. The precision of the measurement system is 0.010mm.

Citation Download Citation

Weimin Li, Xiaozheng Xing, Jin Yi, Hongzhuan Hu, Chao Zhai, and Qiaoyun Yu "The measurement system for fiber positioning unit of LAMOST", Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); https://doi.org/10.1117/12.550880

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