Analysis of LAMOST optical fiber positioning units closed-loop operation by dual-telecentric measurement system

Jiale Zuo; Shipeng Duan; Mengtao Li; Zhigang Liu; Hongzhuan Hu; Jianping Wang; Jiaru Chu; Zengxiang Zhou

doi:10.1117/12.2561446

13 December 2020 Analysis of LAMOST optical fiber positioning units closed-loop operation by dual-telecentric measurement system

Jiale Zuo, Shipeng Duan, Mengtao Li, Zhigang Liu, Hongzhuan Hu, Jianping Wang, Jiaru Chu, Zengxiang Zhou

Author Affiliations +

Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 114456F (2020) https://doi.org/10.1117/12.2561446
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

LAMOST, as the astronomical telescope with the highest spectrum acquisition efficiency in the world, requires high positioning accuracy, the maximum allowable positioning error is only 40μm. Due to various aberrations, the general photogrammetry system cannot meet the requirements of detecting high-precision optical fiber positioning errors. In this study, we proposed a double telecentric measurement system to detect accurately the actual position of fiber positioner by taking advantage of ultra-low distortion and ultra-wide depth of field of telecentric lens. In this paper, the main sources of telecentric lens distortion were analyzed, and the calibration method of polynomial calibration model and dot matrix calibration target was adopted, and the validity of the five parameters obtained by calibration is verified by experiments. The experimental results showed that all optical fibers reached the target after two steps of approximation, and the errors met the positioning requirements.

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Jiale Zuo, Shipeng Duan, Mengtao Li, Zhigang Liu, Hongzhuan Hu, Jianping Wang, Jiaru Chu, and Zengxiang Zhou "Analysis of LAMOST optical fiber positioning units closed-loop operation by dual-telecentric measurement system", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 114456F (13 December 2020); https://doi.org/10.1117/12.2561446

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