基于单片机的LAMOST光纤定位单元碰撞处理系统仿真  

Simulations of Collision between Optical-Fiber Positioning Units of the LAMOST Using Single-Chip Microprocessors

作　　者：刘晓杰[1,2] 王钢[1] 

机构地区：[1]中国科学院光学天文重点实验室(国家天文台),北京100012 [2]中国科学院大学,北京100049

出　　处：《天文研究与技术》2014年第4期423-429,共7页Astronomical Research & Technology

摘　　要：由于超区工作,郭守敬望远镜(LAMOST)光纤定位单元,在定位过程中可能发生碰撞。为了安全运行提高效率,需要有一个硬件碰撞识别处理系统。提出了一种采用脉冲信号计数的方法。利用延时程序在单片机1的I/O口产生3种同频率不同相位的脉冲。将这3种脉冲分别加在相邻的3个光纤单元的光纤架上,由单片机2的计数器累计在设定的时间段内光纤架上的脉冲数,计数结果由单片机2处理,如果计数结果在未发生碰撞的理论值范围内,则电机继续沿原方向旋转,否则说明光纤定位单元发生碰撞,电机将按原方向的反向进行转动。对此进行了仿真实验。To avoid missing survey areas, the light-collection areas of focal-plane optical fibers of the LAMOST （Large sky Area Multi-Object Fiber Spectroscopic Telescope） are set to overlap. Collision between adjacent optical-fiber positioning units may thus occur during their adjustments and affect the instrumental work efficiency. We propose a system based on AT89C51 microprocessors to reverse instrumental state changes caused by collision. During positioning each optical fiber is driven by two stepping motors, which control its central shaft and off-center shaft, respectively. Pulses generated by a delay procedure run in one SCM （Single- Chip Microprocessor） of the system have three patterns which have the same frequency but different phases. Such pulses serve as signals for detecting collision. The counter in each SCM controlling an optical-fiber positioning unit accumulates counts of pulses during a step of the stepping motor. A collision between two units causes pulses to be double counted, which triggers the SCMs to stop the two units and drive them backward. This collision-processing system has succeeded in the LAMOST observation efficiencies. As reported boosting the work efficiency of optical fibers and improving in the paper, we have carried out simulations to test the feasibility of the system using a PROTEUS software package.

关 键 词：单片机 LAMOST 光纤定位单元 AT89C51 脉冲计数 

分 类 号：TN707[电子电信—电路与系统] TH75[机械工程—仪器科学与技术]