| 赵修良,秦慧超,陈希维,高波,周芷千,刘丽艳,贺三军.基于虚拟仪器技术的数字符合测量系统设计与实现[J].南华大学学报(自然科学版),2020,34(4):13~19.[ZHAO Xiuliang,QIN Huichao,CHEN Xiwei,GAO Bo,ZHOU Zhiqian,LIU Liyan,HE Sanjun.Design and Implementation of Digital Coincidence Measurement System Based on Virtual Instrument Technology[J].Journal of University of South China(Science and Technology),2020,34(4):13~19.] |
| 基于虚拟仪器技术的数字符合测量系统设计与实现 |
| Design and Implementation of Digital Coincidence Measurement System Based on Virtual Instrument Technology |
| 投稿时间：2020-03-08 |
| DOI： |
| 中文关键词: 虚拟仪器 数字符合测量 数据处理方案 系统验证 |
| 英文关键词:virtual instrument digital coincidence measurements data processing scheme system verification |
| 基金项目:湖南省核燃料循环技术与装备湖南省协同创新中心开放基金项目(724-0001) |
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| 中文摘要: |
| 根据符合测量和虚拟仪器原理,设计并搭建了数字符合测量系统,并通过测量标准源验证系统性能。该系统硬件部分主要由探测器和前端电子学组成,探测器选用了晶体尺寸为Ф40 mm×40 mm的FJ374型号的NaI(Tl)探头,同时选用BH1218型放大器对脉冲信号进行放大和成形,以匹配PCI-1714UL数据采集卡的采样频率(10 MHz)和输入电压范围(0~5 V);设计了数字符合的数据处理方案,使用LabVIEW编程虚拟仪器数据处理软件,该软件由数据采集、能谱测量、相对时延分析与符合事件甄别三个VI模块组成,实现并替代对应电子模块的功能,能够对采集到的数字信号进行处理,实现数字符合测量。使用该系统测量了60Co标准源,通过测量能谱与相对时间谱确定最佳能窗范围与符合分辨时间,连续测量10次;该标准源的参考活度为101 906.5 Bq,测量结果为101 987.5 Bq,且10次测量的相对误差均在2%以内。实验结果验证了虚拟仪器软件各模块的功能,以及数字符合测量系统的性能。 |
| 英文摘要: |
| According to the principle of coincidence measurement and virtual instrument,a digital coincidence measurement system is designed and built,and verified by the measurement standard source.The system only retains the detector and front-end electronics.The detector uses two FJ374 type NaI (Tl) probe with a crystal size of Ф40 mm×40 mm,and a BH1218 amplifier is used to amplify and shape the pulse signal to match PCI-1714UL data acquisition card of the sampling frequency (10 MHz) and input voltage range (0~5 V);A digitally compatible data processing scheme is designed,using LabVIEW to program virtual instrument processing software to process the collected digital signals to achieve digital conformance measurement;the software is composed of three VI modules of data acquisition,energy spectrum measurement,relative time delay analysis,and coincidence event identification,which implement and replace the functions of corresponding electronic modules.It measures the 60Co standard source,determines the best energy window range and coincidence resolution time by measuring the energy spectrum and time spectrum,and make 10 consecutive measurements;the reference activity of the standard source is 101 906.5 Bq,and the measurement result is 101 987.5 Bq,and the relative errors of 10 measurements are all within 2%.The experimental results verify the function of each module of the virtual instrument software and the performance of the digital compliance measurement system. |
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