4πβ-γ符合计数系统软件设计

4πβ-γ Coincidence Counting System Software Design

4πβ-γ符合计数系统是为4πβ(LS)-γ放射性活度国家基准设计的一套高性能电子学系统,与传统模拟符合相比,具有信号实时处理及存储等特点,可完成离线符合计算。论文介绍了符合计数系统的架构、工作流程以及数据传输格式和数据量,阐述了软件开发的流程和处理大数据量的方法,DMA的具体操作和后期离线数据处理程序。软件运行于基于PXI机箱的XP系统,可以达到30 Mbps的稳定写入速度,并提供了一个友好的人机界面。数据离线处理软件可以合并采集数据,根据不同需求产生有用的数据格式,方便后期统计计算。

4πβ-γ coincidence counting system is a high-performance electronics system designed for 4πβ（LS）-γ radioactivity primary standard.As compared with the conventional analog system,it can perform real-time signal processing and storage for the latter coincidence calculation.This paper introduces the architecture of the coincidence counting system and its workflow,as well as the format and the amount of data transferred.It describes software development process and methods of processing large amounts of data,DMA specific operations and offline data processing software.Software running on the XP system based on PXI chassis can achieve stable 30 MBps writing speed.Meanwhile,the software provides a friendly interface.Offline data processing software can merge data collection,generating useful data formats according to different needs,which facilitates statistical calculations.