大型望远镜主镜位置采集系统设计

摘要

对大型望远镜主镜位置进行高精度实时采集是实现主镜位置控制,提高望远镜成像质量的前提.设计了大型望远镜主镜位置采集系统,包括位置采集模块和上位机软件.位置采集模块对位移传感器信号进行调理后使用24bit的ADC芯片ADS1259实现模数转换,采用DSP处理转换后的数字信号并与上位机通信,同时实现CAN总线组网;上位机软件使用python语言设计,实现主镜位置信息的实时处理和显示.经过测试,该系统的采集误差小于2μm,能够实现对望远镜主镜位置信号的高精度采集.%High precision primary mirror position real-time acquisition of the large telescope is the premise to realize the primary mirror position control and improve the image quality.The primary mirror position acquisition system of the large telescope is designed,including the position acquisition module and the PC software.The position acquisition module is used to condition analog signal from displacement sensor,convert analog signal to digital signal through 24 bit ADC-ADS1259,process digital signal by DSP,communicate with the PC,and set up the LAN by CAN field-bus.The PC software programed by python is used to realize primary mirror position information real-time processing and displaying.Through testing,it is found that acquisition error is less than 2 μm,and the precision of the primary mirror position acquisition system can satisfy the requirement.