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.
出处
《分析测试学报》
CAS
CSCD
北大核心
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)
