飞行时间质谱仪数据采集系统设计  

Design of a Data Acquisition System for Time-of-flight Mass Spectrometer

作　　者：郭静[1] 龙涛[2] 包泽民[1] 王培智[1] 田地[1] 刘敦一[2] 

机构地区：[1]吉林大学仪器科学与电气工程学院,吉林长春130061 [2]中国地质科学院地质研究所北京离子探针中心,北京102206

出　　处：《分析测试学报》2014年第12期1426-1430,共5页Journal of Instrumental Analysis

基　　金：国家重大科学仪器设备开发专项项目(2011YQ050069;2011YQ05006906)

摘　　要：针对飞行时间质谱仪高分辨率、宽质量范围的特点,设计了一种高精度、大量程的数据采集系统。系统对前端信号进行放大、幅度甄别和电平转换,使用专用时间间隔测量芯片TDC-GPX测量脉冲时间间隔,应用现场可编程门阵列(FPGA)进行时序控制,通过通用串行总线(USB 2.0)接口与计算机连接,采用时分复用技术实现上位机对采集系统的控制及高速数据传输。测试结果表明,单通道测量精度小于100 ps,测量范围大于500μs,可进行8个通道测量。As the high resolution and wide mass measurement range characteristics of a time-of-flight mass spectrometer,a high precision and wide range data acquisition system was designed in this paper.The system completed the amplification,discrimination and level conversion for the front-end signal.A high precision time interval measuring chip TDC-GPX was used to measure the pulses＇ time interval.A field programmable gate array （FPGA） realized the sequential control.A Universal Serial Bus（USB 2.0） interfaced with a computer.The host computer＇s controlment and high-speed data transmission were realized with the time division multiplexing technology.Testing results showed that the single-shot precision is less than 100 ps,the range of measurement time is beyond of 500 μs and the number of measurement channels could be up to 8.

关 键 词：飞行时间质谱仪 时间数字转换器(TDC) 数据采集 现场可编程门阵列(FPGA) 

分 类 号：O657.3[理学—分析化学] O629.73[理学—化学]