位移传感器数据高精度采集电路设计  

Design of High Precision Data Acquisition Circuit of Displacement Sensor

作　　者：张斌[1] 栾红民 李玉霞[1] 吴庆林[1] 王晶[1,2] 曲云昭 ZHANG Bin1 ,LUAN Hongmin1,2 ,LI Yuxia1, WU Qinglin1, WANG Jing1,2, QU Yunzhao1,2(1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China ; 2. University of Science Academy of Sciences ,Beijing 101400, Chin)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院大学,北京101400

出　　处：《电子器件》2017年第5期1204-1208,共5页Chinese Journal of Electron Devices

基　　金：中国科学院长春光学精密机械与物理研究所重大创新项目专项基金项目(Y3C122E130)

摘　　要：对位移传感器数据进行高精度采集是实现大型望远镜主镜位置监控的关键环节。详细分析了位移传感器数据采集电路的输入需求并依此设计硬件电路。将位移传感器信号经过缩放、滤波等调理后输入至ADC芯片ADS1259完成A/D转换;使用DSP芯片TMS320F28069读取ADS1259输出的数字信号,解码后发送给PC机进行处理与显示。同时设计了CAN总线接口,用来实现分布式采集电路组建局域网。经过测试,采集电路的有效分辨率可达到17 bit,位移采集误差小于2μm,相对误差小于0.01%,能够实现对位移传感器信号的高精度采集,为望远镜主镜监控提供保证和依据。High precision acquisition of displacement transducer data is the key link to realize the position monitoring and controlling of the primary mirror of large telescope. Input requirements of the acquisition circuit,according to which hardwares are designed,are analyzed in detail. The displacement transducer signal is conditioned by scaling and filtering,then inputs to the ADC chip ADS1259 to realize A/D conversion. DSP chip TMS320 F28069 is used to read the digital data output by ADS1259,and to sent them to PC for processing and display after decoding. Meanwhile,the CAN bus interface is designed to establish the LAN between distributed acquisition circuit. After testing,the effective resolution can reach 17 bit,and acquisition displacement error less than 2 μm,the relative error is less than 0.01%,the acquisition circuit could collect the displacement transducer signal with high precision,and provides the guarantee and foundation for the telescope primary mirror monitoring and controlling.

关 键 词：位移传感器 数据采集 信号调理 CAN 望远镜 

分 类 号：TN710[电子电信—电路与系统]