基于PXIe总线的高速数据采集程控系统

High-speed data acquisition system based on PXIe bus

针对单粒子撞击测试中窄脉冲信号的长时间检测问题,提出了一种基于PXIe总线以及数据采集卡的高速数据采集程控系统,实现了高速数据采集存储、实时脉冲数量统计、数据回放、远程控制仪器等方面功能,采用NI-PXI-5122数据采集卡实现了4通道、50 MSPS/Ch采样率、14 bit采样精度的同步采样,采用NI-HD-8265磁盘阵列实现了380 Mbyte/s以上数据流量1 h的连续流盘存储,应用Lab VIEW开发了系统软件,对采集流盘和程控仪器进行控制,利用模拟实验平台产生脉冲信号对系统的采集存储能力进行了测试。研究结果表明,该系统能以高采样率进行多通道的长时间数据采集,能够实现实时脉冲数量统计、数据回放、计算机远程控制等多项功能。

Aiming at the data acquisition and instrument controlling tasks in the single-particle impact test,a high-speed data acquisition program controlled system based on PXIe bus and digitizer was built. Features as high-speed data acquisition and streaming,real-time pulse counting,data playback,instrument remote control were established. 4 channels,50 MSPS / Ch sample rate,and 14 bit resolution synchronous data acquisition were accomplished with NI-PXI-5122 digitizer. 380 Mbyte / s throughput data storage for over an hour was achieved using NI-HD-8265 disk array. System software featuring instrument remote control and high performance streaming was developed with LabVIEW. The data acquisition and streaming performance of the system was tested in simulated experiment platform with 6μs width pulse signal. The result indicates that the system is capable to acquired and stream high speed data for several hours,and accomplish demanded functions as real-time pulse counting,data playback and instrument remote control.