数字核谱仪系统中脉冲幅度提取方法研究  

Pulse amplitude extraction in digital nuclear spectrometer system

作　　者：张怀强[1,2] 汤彬[3] 吴和喜[2] 

机构地区：[1]核资源与环境省部共建国家重点实验室培育基地(东华理工大学),南昌330013 [2]东华理工大学核工程与地球物理学院,南昌330013 [3]核技术应用教育部工程研究中心,南昌330013

出　　处：《核技术》2013年第5期71-75,共5页Nuclear Techniques

基　　金：国家863项目(2012AA061804);东华理工大学博士基金项目(DHBK201111);核资源与环境教育部重点实验室开放基金项目(NRE1215)资助

摘　　要：数字核谱仪系统中脉冲幅度提取的准确性与实时性直接影响到系统的能量分辨率与脉冲通过率。本文对高速ADC采样后的数字核信号脉冲幅度提取方法进行研究,将幅度提取方法按直接比较法、曲线拟合法与滤波成形法的工作原理展开讨论。采用上述三种方法对实际采样的数字核信号进行脉冲幅度提取,在40 MHz的采样频率下,分别采用曲线拟合法与滤波成形法对脉冲幅度进行提取,得到各自的能谱。通过理论分析,实验比较与测试,综合能量分辨率与脉冲计数率的性能,得到最佳的脉冲幅度提取方法为滤波成形法。Background： The accuracy and real-time performance of pulse amplitude extraction in digital nuclear spectrometer system directly influence the system energy resolution and the maximum count rates. Purpose： This paper attempts to study the amplitude extraction method of digital nuclear signal, which comes from the high speed ADC. Methods： In this paper, according to the principle of operation, the extraction method is categorized into three types： direct comparison method, curve fitting method and filter shaper method, also the operating principle of the three methods are analysed and discussed. Results： The above three methods are employed to process actual sampled digital nuclear signal at the sampling frequency of 40 MHz, the curve fitting method and filter shaper method are respectively used to extract the pulse amplitude and get their energy spectrum. Conclusions： Taking into account the resolution and pulse counting rate, after theoretical analysis, experimental comparison and test, the optimal pulse amplitude extraction method is filter shaper method.

关 键 词：数字核谱仪 脉冲幅度提取 直接比较法 曲线拟合法 滤波成形法 

分 类 号：TL822[核科学技术—核技术及应用]