基于MATLAB的核脉冲信号数字成形实现与性能分析

张怀强; 卢炜煌; 汤彬

doi:10.11889/j.0253-3219.2018.hjs.41.100401

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基于MATLAB的核脉冲信号数字成形实现与性能分析

核电子学与仪器 | 更新时间：2021-05-19

- 基于MATLAB的核脉冲信号数字成形实现与性能分析
- Digital shaping and performance analysis of nuclear pulse signal based on MATLAB
- 核技术 2018年41卷第10期文章编号：100401
- 作者机构：
  
  1.东华理工大学核技术应用教育部工程研究中心南昌 330013
  2.东华理工大学核科学与工程学院南昌 330013
- 作者简介：
  
  [ "张怀强, 男, 1981年出生, 2011年于成都理工大学获博士学位, 副教授, 从事核探测技术与核仪器研究instruments", "ZHANG Huaiqiang, male, born in 1981, graduated from Chengdu University of Technology with a doctoral degree in 2011, associate professor, focusing on nuclear detection technology and nuclear" ]
- 基金信息：
  
  国家重点研发计划“重大科学仪器设备开发”重点专项(2017YFF0106503);国家留学基金委(201708360170);国家自然科学基金(11665001);江西省“百人远航工程”项目、核技术应用教育部工程研究中心开放基金项目(HJSJYB2014-03)
- DOI：10.11889/j.0253-3219.2018.hjs.41.100401
  中图分类号： TL817
- 收稿日期：2018-05-14，
  
  修回日期：2018-06-14，
  
  纸质出版日期：2018-10-10
- 稿件说明：
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张怀强, 卢炜煌, 汤彬. 基于MATLAB的核脉冲信号数字成形实现与性能分析[J]. 核技术, 2018,41(10):100401

Huaiqiang ZHANG, Weihuang LU, Bin TANG. Digital shaping and performance analysis of nuclear pulse signal based on MATLAB[J]. Nuclear techniques, 2018, 41(10): 100401
张怀强, 卢炜煌, 汤彬. 基于MATLAB的核脉冲信号数字成形实现与性能分析[J]. 核技术, 2018,41(10):100401 DOI： 10.11889/j.0253-3219.2018.hjs.41.100401.

Huaiqiang ZHANG, Weihuang LU, Bin TANG. Digital shaping and performance analysis of nuclear pulse signal based on MATLAB[J]. Nuclear techniques, 2018, 41(10): 100401 DOI： 10.11889/j.0253-3219.2018.hjs.41.100401.

摘要

数字核谱仪系统中数字成形方法与成形参数的选取影响着脉冲信号的噪声抑制、堆积识别、幅度提取，进而直接影响系统的能量分辨率与最大脉冲计数率等主要性能指标。研发一套基于MATLAB的数字核信号处理平台，可分别实现仿真核信号，采样核信号在不同数字成形方法、不同成形参数下的高斯成形、梯形成形与三角成形输出的同时，可构建具有多套数字成形算法验证平台。通过对

137

Cs（NaI探测器）的γ能谱与Fe源（Si-PIN探测器）的X荧光能谱测试可得：数字高斯成形表现出更好的能量分辨率特性；三角成形表现出更好的最大脉冲计数率特性；梯形成形表现出更好的综合特性。采用梯形成形对

137

Cs能谱和高斯成形对Fe的特征X射线能谱测试可知：随着成形参数的增加，能量分辨率越好，最大脉冲计数率越低。

Abstract

Background

The noise suppression

pile-up identification and amplitude extraction of the pulse signal are affected by the choice of digital shaping method and parameters in the digital nuclear spectrometer system

which directly affect the system's energy resolution and maximum pulse count rate.

Purpose

We developed a digital signal processing platform based on MATLAB to build multiple digital shaping algorithm verification platforms and implement nuclear pulse signal processing.

Methods

The simulation nuclear signals and the sampled signals can be achieved separately to Gaussian

trapezoidal and triangular shapes in different digital shaping methods and different shaping parameters

and then completed pile-up identification

baseline estimation and amplitude extraction.

Results

The γ-ray energy spectrum of

137

Cs (NaI detector) and X-ray energy spectrum of Fe source (Si-PIN detector) are obtained respectively in different digital shaping methods and different shaping parameters.

Conclusion

The digital gaussian shaping shows better energy resolution characteristics

triangular shaping shows better maximum pulse count rate characteristics

and trapezoidal shaping shows better overall characteristics. Trapezoidal shaping is used to obtain the

137

Cs energy spectrum and the Gaussian shaping is used to obtain the Fe energy spectrum

which shows that as the shaping parameters increase

the energy resolution is better and the maximum pulse count rate is lower.

关键词

Keywords

references

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