基于FPGA的三自由度精密激光转台控制系统  

Three freedom degrees precision laser turntable control system based on FPGA

作　　者：叶蔚然[1,2] 孙志斌[1] 耿宝明 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190 [2]中国科学院大学,北京100049

出　　处：《电子设计工程》2014年第11期15-18,共4页Electronic Design Engineering

基　　金：国家自然科学基金(61274024);国家自然科学青年科学基金(40804032)

摘　　要：为了实时监控大型高海拔宇宙线观测站内激光在大气中传输衰减特性,设计一个精密激光转台向站内不同探测器指定方向发射激光脉冲。系统采用Actel FPGA为主控制器,A3977驱动两相混合式步进电机工作,TR绝对值编码器反馈3个方向上的角度数据,实现闭环控制,并将FPGA通过RS422接至本地PC,再接入互联网即可与远程控制端进行通信。最终实现激光转台每个方向均小于0.01°误差的精确定位,且能通过互联网实现远程控制。In order to monitor the atmospheric aerosol attenuation of the Large High Altitude Comic Ray Observatory, we design a precision laser turntable to emit laser pulses for various detectors in certain directions. We take Actel FPGA as the main controller for the control system of the turntable, A3977 to drive three two-phase hybrid stepping motors, and TR absolute encoder to collect angle data of three directions. And we implement a closed-loop control. And then, we connect to a local PC via RS422, through which we can control the system anywhere with internet.Eventually, the laser turntable achieve precise positioning less than 0.01 ° error in each direction, and can achieve remote control via the Internet.

关 键 词：FPGA A3977 激光转台 步进电机 绝对值编码器 

分 类 号：TN99[电子电信—信号与信息处理]