SMART: the closed-loop control system for LAMOST

Anzhi Wang; Zhaoxv Gan; Yilong Liu; Jiabin Wang; Gang Yue; Yunxiang Yan; Shengjia Wang; Qi Yan; Tao Geng; Pengfei Wang; Shuang Chen; Weimin Sun

doi:10.1117/12.3019967

26 August 2024 SMART: the closed-loop control system for LAMOST

Anzhi Wang, Zhaoxv Gan, Yilong Liu, Jiabin Wang, Gang Yue, Yunxiang Yan, Shengjia Wang, Qi Yan, Tao Geng, Pengfei Wang, Shuang Chen, Weimin Sun

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131006C (2024) https://doi.org/10.1117/12.3019967
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The accuracy of fiber positioning is crucial for the observation of multi-target fiber spectral telescopes such as LAMOST (Large Sky Area Multi-Object Fiber Spectroscopy Telescope). Most of the methods used for fiber positioning are openloop control or semi-closed-loop control, the efficiency cannot meet the requirements of next-generation spectral telescopes. Considering that, this paper proposes a fiber positioning method that can achieve a completely closed loop without blind spots based on SMART (Special-shaped Micro-lens Aimer for Real-time Targeting) and a dual-rotary positioning mechanism. The entire correction process can be described as follows: first, the light intensity obtained by the 6-channel photodetector is stored in a buffer. Then the pulses required for correction are calculated based on the data in the buffer and the correction algorithm by the computer. The running command is then sent to the stepper motor controller using serial communication to drive the stepper motor. After the movement, the program will run again to verify if the correction is done. After selecting a position in the first quadrant, 8 directions were selected to conduct automatic correction experiments after the optical fiber position offset. The experimental results show that the average farthest distance that the method could correct is 600μm, and 75.9% positioning accuracy under our closed control method can reach 10μm, 94.8% positioning accuracy can reach 20μm, 100% positioning accuracy can reach 30μm. For corrections within the 500μm offset distance, 97.5 % of the correction time is within one minute.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Anzhi Wang, Zhaoxv Gan, Yilong Liu, Jiabin Wang, Gang Yue, Yunxiang Yan, Shengjia Wang, Qi Yan, Tao Geng, Pengfei Wang, Shuang Chen, and Weimin Sun "SMART: the closed-loop control system for LAMOST", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131006C (26 August 2024); https://doi.org/10.1117/12.3019967

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