29 June 2006 Preliminary design of the collision avoidance device on the fiber positioning units of LAMOST
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Abstract
This paper constructed two protecting methods of diminishing the collision during the opposite movement of the adjoining fiber unit in the LAMOST Positioning System. Auto-positioning mode is applied to every fiber positioning unit of LAMOST Positioning System. The observing region is a circular region with the diameter of 33 mm. To ensure the whole focal plane is covered by the observing region of 4000 fiber units, there must be superposition of observing region of each adjoining fiber units, which induced the collision of adjoining fiber holder in the movement process and resulted in the failing of orientation and mangling of structure. The mode of avoiding the collision comprises two methods. One is hard protected mode, according to this method sensors are installed at each fiber positioning unit, then the motion of the fiber units will be stopped immediately when the adjoining fiber units close to a dangerous distance. The other is soft protected mode, which deliberates every situation of software from the observation programming to the motion path designing for avoiding the collision. This paper expounds the designing and achievement of these two methods mentioned formally.
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Chao Zhai, Chao Zhai, Zhikun Zhou, Zhikun Zhou, Yi Jin, Yi Jin, Hongzhuan Hu, Hongzhuan Hu, } "Preliminary design of the collision avoidance device on the fiber positioning units of LAMOST", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 626938 (29 June 2006); doi: 10.1117/12.669325; https://doi.org/10.1117/12.669325
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