基于单片机的LAMOST光纤定位单元碰撞处理系统仿真
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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 opticalfiber 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 boosting the work efficiency of optical fibers and improving the LAMOST observation efficiencies.As reported in the paper,we have carried out simulations to test the feasibility of the system using a PROTEUS software package.
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 opticalfiber 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 boosting the work efficiency of optical fibers and improving the LAMOST observation efficiencies.As reported in the paper,we have carried out simulations to test the feasibility of the system using a PROTEUS software package.
引文
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[2]LAMOST工程指挥部.LAMOST可行性研究报告[R].北京:LAMOST工程指挥部,1997.
[3]李为民,胡红专,俞巧云,等.LAMOST并行可控式光纤定位单元及其控制技术研究[J].国内科技,2000(4):33-34+38.Li Weimin,Hu Hongzhuan,Yu Qiaoyun,et al.The research on the positioning unit and its control method of parallel controllable optical fiber positioning system for LAMOST[J].Demestic Science and Technology,2000(4):33-34+38.
[4]邢晓正,胡红专,杜华生,等.用于LAMOST的并行可控式光纤定位系统[J].中国科学技术大学学报,1997,27(4):492-493.Xing Xiaozheng,Hu Hongzhuan,Du Huasheng,et al.A parallel controllable optical fiber positioning system for LAMOST[J].Journal of China University of Science and Technology,1997,27(4):492-493.
[5]颜芳,翟超,舒钊,等.利用脉冲比对方法实现LAMOST光纤定位单元碰撞检测[J].仪器仪表学报,2008,29(8):1638-1642.Yan Fang,Zhai Chao,Shu Zhao,et al.Collision avoidance device on fiber positioning units in LAMOST based on pulse comparison[J].Chinese Journal of Scientific Instrument,2008,29(8):1638-1642.
[6]颜芳,翟超,舒钊,等.LAMOST光纤定位单元防碰撞系统[J].机械与电子,2007(8):3-6.Yan Fang,Zhai Chao,Shu Zhao,et al.The collison avoidance device on the fiber positioning units of LAMOST[J].Machinery&Electronics,2007(8):3-6.
[7]刘文淘.MCU-51单片机培训课程(C51版)[M].北京:电子工业出版社,2005:20-128.
[8]潘万平,徐刚,张劲松.基于Proteus的步进电机闭环控制的仿真[J].煤矿机械,2010,31(2):46-47+48.Pan Wanping,Xu Gang,Zhang Jinsong.Proteus-based closed-loop control of stepper motor simulation[J].Coal Mine Machinery,2010,31(2):46-47+48.
[2]LAMOST工程指挥部.LAMOST可行性研究报告[R].北京:LAMOST工程指挥部,1997.
[3]李为民,胡红专,俞巧云,等.LAMOST并行可控式光纤定位单元及其控制技术研究[J].国内科技,2000(4):33-34+38.Li Weimin,Hu Hongzhuan,Yu Qiaoyun,et al.The research on the positioning unit and its control method of parallel controllable optical fiber positioning system for LAMOST[J].Demestic Science and Technology,2000(4):33-34+38.
[4]邢晓正,胡红专,杜华生,等.用于LAMOST的并行可控式光纤定位系统[J].中国科学技术大学学报,1997,27(4):492-493.Xing Xiaozheng,Hu Hongzhuan,Du Huasheng,et al.A parallel controllable optical fiber positioning system for LAMOST[J].Journal of China University of Science and Technology,1997,27(4):492-493.
[5]颜芳,翟超,舒钊,等.利用脉冲比对方法实现LAMOST光纤定位单元碰撞检测[J].仪器仪表学报,2008,29(8):1638-1642.Yan Fang,Zhai Chao,Shu Zhao,et al.Collision avoidance device on fiber positioning units in LAMOST based on pulse comparison[J].Chinese Journal of Scientific Instrument,2008,29(8):1638-1642.
[6]颜芳,翟超,舒钊,等.LAMOST光纤定位单元防碰撞系统[J].机械与电子,2007(8):3-6.Yan Fang,Zhai Chao,Shu Zhao,et al.The collison avoidance device on the fiber positioning units of LAMOST[J].Machinery&Electronics,2007(8):3-6.
[7]刘文淘.MCU-51单片机培训课程(C51版)[M].北京:电子工业出版社,2005:20-128.
[8]潘万平,徐刚,张劲松.基于Proteus的步进电机闭环控制的仿真[J].煤矿机械,2010,31(2):46-47+48.Pan Wanping,Xu Gang,Zhang Jinsong.Proteus-based closed-loop control of stepper motor simulation[J].Coal Mine Machinery,2010,31(2):46-47+48.