【摘要】 针对天文光谱观测系统使用的传光光纤在布放和观测过程中因弯曲和入射中心未对准光纤中心而导致的焦比退化效应,采用光学追迹方法进行了分析计算。根据我国大天区面积多目标光纤光谱望远镜(LAMOST)工程中实际使用的光纤光缆的参数,分析并计算了所用传光光纤的使用条件,为工程应用提供参考。根据分析计算的结果,在LAMOST工程中光纤对准误差设计值为不大于32μm的条件下,LAMOST工程中光纤光缆施工安装及观测使用过程中最小弯曲半径应限制在不小于300mm。更多还原

【Abstract】 Ray tracing was used to analyze the Focal Ratio Degradation (FRD) properties of fibers, which is caused by the light transmitting in the fibers with offset and bending when we set the fibers and observe stars in astronomy. We analyzed and calculated the conditions of the fibers used in the Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) according to the parameters of the fiber cables used in the LAMOST. These works provide useful reference in this project. According to the analysis and computation, the designed aim error of fibers should be less than 32 μm at least. The least bending radii is 300 mm when the fibers are installed for observation in the LAMOST projection.更多还原