Method of pulse baseline estimate and deduction for digital gamma energy spectrometer

Haitao WANG; Bin TANG; Renbo WANG; Jinhui QU; Xiongjie ZHANG; Rui CHEN; Zhifeng LIU

doi:10.11889/j.0253-3219.2018.hjs.41.050402

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Method of pulse baseline estimate and deduction for digital gamma energy spectrometer

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-19

- Method of pulse baseline estimate and deduction for digital gamma energy spectrometer
- NUCLEAR TECHNIQUES Vol. 41, Issue 5, Article number: 050402(2018)
- 作者机构：
  
  1.东华理工大学教育部核技术应用工程研究中心江西 330013
  2.东华理工大学江西 330013
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China;National Key R & D Project;Science and Technology Project Founded by the Education Department of Jiangxi Province;Open Fund of Engineering Research Center of Nuclear Technology Application (East China University of Technology)
- DOI：10.11889/j.0253-3219.2018.hjs.41.050402
  CLC： TL817.2
- Received：24 January 2018，
  
  Revised：16 March 2018，
  
  Published：10 May 2018
- 稿件说明：
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Haitao WANG, Bin TANG, Renbo WANG, et al. Method of pulse baseline estimate and deduction for digital gamma energy spectrometer[J]. Nuclear techniques, 2018, 41(5): 050402
DOI：

Haitao WANG, Bin TANG, Renbo WANG, et al. Method of pulse baseline estimate and deduction for digital gamma energy spectrometer[J]. Nuclear techniques, 2018, 41(5): 050402 DOI： 10.11889/j.0253-3219.2018.hjs.41.050402.

摘要

在γ能谱测量系统中，基线的估计与扣除一直是脉冲幅度测量处理过程中的一个重要环节。随着γ能谱测量系统的数字化，基线的估计与扣除方法也需要作相应的改进。目前相对复杂的算法只能是先对输入射线脉冲经数字化采样后，再在计算机上编程实现，不适用于以现场可编程门阵列（Field Programmable Gate Array，FPGA）等为核心的数字化系统。部分可以在FPGA上实现的算法，在估计基线时没有充分考虑正常核脉冲信号对基线的影响，精度和实时性相对不足。为解决这一问题，本文提出了一种可在FPGA上实现的脉冲基线估计与扣除方法。该方法通过对采样得到的原始脉冲信号进行去异常滑动平均滤波法，进而求得原始输入脉冲的直流基线，并对该基线进行扣除。而脉冲基线的扣除，必将降低仪器后续处理的复杂度。经实验验证：此方法算法简单、精度好、灵敏度高、可在FPGA上编程实现、可以抑制低频干扰和温度漂移等因素对基线的影响，能够在一定程度上提高能量分辨率，抑制谱线漂移。该方法不仅可以用于数字化γ能谱测量系统，也可以应用于测量其他类型射线（如X射线）的数字化谱仪。

Abstract

Background

In the gamma energy spectrum measurement system

estimation and deduction of the baseline has been an important part of pulse amplitude measurement processing. With the digitalization of gamma energy spectrometer

the baseline estimation and deduction method also need to make corresponding improvement.

Purpose

Some relatively complex algorithms which with digital sampling of original pulses only can be realized on a computer

but not suitable for the digital systems which based on field programmable gate array (FPGA). Some algorithms which could be executed on FPGA didn't fully consider the influence of the normal pulse signal

which have poor real-time performance and accuracy. To solve this problem

paper puts forward a kind of new algorithm which could estimate and deduct the pulse baseline. The most important is that it can implement on FPGA.

Methods

This method is called moving average filter after excluding abnormal signal (MAEA). That is based on the original pulse signal

which obtained by analog-to-digital (A/D) sampling

pulses are viewed as abnormal signals

superimposed on the direct-current (DC) baseline

which need to be deducted. Then DC baseline is obtained by the moving average filtering method. While the pulse DC baseline is deducted by FPGA

the complexity of the instrument for subsequent processing will be lower.

Results

After experimental verification

this method has some characteristics:simple algorithm

well accuracy and high sensitivity. It not only could inhibit the signal's influence on the baseline such as low frequency interference and temperature drift

but also could track the change of the baseline real time and accurately and suppress spectral drift to a certain extent.

Conclusion

This method not only can be used for digital gamma energy spectrum measurement system

also can be used applied to other types

such as X-ray digital spectrometer.

关键词

Keywords

references

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