基于FPGA的精密时间间隔测量仪设计.pdfVIP

， ， ( 中国工程物理研究院 流体物理研究所，四川 绵阳 621900) 摘 要 ：介绍一种基于 FPGA 的精密时间间隔测量仪的研制过程。精密时间间隔测量仪是应 科学试验中高可靠性、高精密度和多通道等测量要求而研制的。精密时间间隔测量仪以 PXI 接口 为平台设计成为虚拟仪器，一个 PXI 系统可插多个精密时间间隔测量仪板卡，每个板卡可对 1 个 起始通道与 8 个停止通道的脉冲信号进行时间间隔测量，同时测量停止脉冲的脉冲宽度。精密时 间间隔测量仪以 FPGA 为测时核心，利用锁相环倍频和时钟分相技术，测量分辨力可达到 1 ns ，测 时范围可达 10 ns~10 ms。 关键词 ：时间间隔测量；现场可编程门阵列 ；面向仪器系统的 PCI 扩展 ；虚拟仪器 中图分类号：TN874 ；TM935.15 文献标识码 ：A A Design for the Precise Time-interval Measuring Instrument Based FPGA YE Chao，FENG Li，OUYANG Yan-jing (Institute of Fluid Physics，China Academy of Engineering Physics，Mianyang Sichuan 621900，China) Abstract： A design for the Precision Time-interval Measuring Instrument (PTMI) based on FPGA is introduced. The PTMI is manufactured for the rigorous requirements such as high precision, high stability, multi-channels and so on. The PTMI is designed as Virtual Instrument with a interface of PXI. A PCI extensions for Instrumentation(PXI) system can be inserted in by many PTMI boards. A PTMI board can measure the time-interval from the signal in a start channel to the signals in other 8 stop channels. It can measure the width of the pulse signals in these stop channels as well. Taking the FPGA as a core，by the technology of clock delay and multi- frequency with PLL, the PT MI can gain a resolution of 1 ns and a range from 10ns to 10ms. Key words：time-interval measuring；Field Programmable Gate Array(FPGA)；PCI extensions for Instrumentation；Virtual Instrument 精密时间间隔测量在爆轰与粒子判别等科学实验中发挥着重要作用，同时在原子物理、天文实验、激光测距、 定位定时、航天遥测遥控等很多领域也有广泛应用。这些用作时间间隔测量的仪器，包括通用计数器、数字存储 示波器、多通道高精度时间间隔测量仪等，都有各自的特点。 通用计数器价格昂贵，操作不便，测量通道很少，已逐渐退出时间间