基于基线自动恢复技术的数字多道能谱仪

陈伟; 周建斌; 方方; 洪旭; 赵祥; 周伟; 马英杰

doi:10.11889/j.0253-3219.2018.hjs.41.050401

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基于基线自动恢复技术的数字多道能谱仪

核电子学与仪器 | 更新时间：2021-05-19

- 基于基线自动恢复技术的数字多道能谱仪
- Design of digital multi-channel spectrometer based on auto-baseline restoration
- 核技术 2018年41卷第5期文章编号：050401
- 作者机构：
  
  1.成都理工大学核技术与自动化工程学院成都 610059
  2.成都航空职业技术学院信息工程学院成都 610100
- 作者简介：
  
  [ "陈伟, 男, 1978年出生, 2008年于成都理工大学获硕士学位, 现为博士研究生, 从事核测控技术研究", "CHEN Wei, male, born in 1978, graduated from Chengdu University of Technology with a master's degree in 2008, doctoral student, engaged in nuclear measurement and control technology" ]
  周建斌, E-mail:zjb@cdut.edu.cn ZHOU Jianbin, E-mail:zjb@cdut.edu.cn
- 基金信息：
  
  国家重点研发计划项目(2016YFC1402505);国家自然科学基金(11475036);国家自然科学基金(11675028)
- DOI：10.11889/j.0253-3219.2018.hjs.41.050401
  中图分类号： TL822.4
- 收稿日期：2017-05-25，
  
  修回日期：2017-08-10，
  
  纸质出版日期：2018-05-10
- 稿件说明：
移动端阅览
陈伟, 周建斌, 方方, 等. 基于基线自动恢复技术的数字多道能谱仪[J]. 核技术, 2018,41(5):050401

Wei CHEN, Jianbin ZHOU, Fang FANG, et al. Design of digital multi-channel spectrometer based on auto-baseline restoration[J]. Nuclear techniques, 2018, 41(5): 050401
陈伟, 周建斌, 方方, 等. 基于基线自动恢复技术的数字多道能谱仪[J]. 核技术, 2018,41(5):050401 DOI： 10.11889/j.0253-3219.2018.hjs.41.050401.

Wei CHEN, Jianbin ZHOU, Fang FANG, et al. Design of digital multi-channel spectrometer based on auto-baseline restoration[J]. Nuclear techniques, 2018, 41(5): 050401 DOI： 10.11889/j.0253-3219.2018.hjs.41.050401.

摘要

不同放射性强度的测量应用中，探测器输出核脉冲信号的基线将发生漂移，进而造成多道能谱仪的谱线漂移和能量分辨率损失。尽管采用数字基线估计方法可以对核脉冲信号的基线进行正确估计，但纯数字基线恢复算法无法有效处理核脉冲信号基线漂移对前端电路的影响。采用最小平均值基线估计方法，先在现场可编程门阵列（Field-Programmable Gate Array，FPGA）中进行数字基线估计；然后通过SPI总线将基线估计值传入微控制器（Micro-Controller Unit，MCU），MCU根据基线值判断是否进行基线调节，将基线估计值传入数模转换器（Digital-to-analog Converter，DAC）；最后在前端电路中实现核脉冲信号的基线恢复。基于LaBr

（Ce）探测器的测试结果表明：采用该基线自动恢复技术的数字化多道能谱仪能够实现核脉冲信号的基线自动恢复。在高放射性测量条件下，测量系统能够解决因基线漂移引起的谱线漂移问题，使系统能量分辨率保持稳定。

Abstract

Background

The baseline drift of detector output could result in spectrum drift and energy resolution loss of the multi-channel spectrometer. Though baseline estimation approaches can obtain the baseline of nuclear signals

they are not able to reduce the effect of baseline drift on the front-end circuit.

Purpose

This study aims to design and implement a multi-channel spectrometer with auto-baseline restoration functionality.

Methods

First of all

the baseline of detector's output is estimated by using minimum average method and implemented in the field-programmable gate array (FPGA). Then the estimation value is sent to micro-controller unit (MCU) for regulation condition judgment

and to digital-to-analog converter (DAC) for necessary baseline adjustment. Finally

the baseline of detector output is restored in the front-end circuit. A multi-channel spectrometer is designed based on LaBr

(Ce) detector and this auto-baseline restoration functionality.

Results

The experimental results imply that the designed multi-channel spectrometer can realize baseline restoration automatically.

Conclusion

Under the situation of high radioactivity

the baseline drift of detector output can be solved by this multi-channel spectrometer

and the energy resolution of the system can remain stable.

关键词

Keywords

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