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一种基于阶梯阈值的射线违禁品探测方法

陈勇 常青青

陈勇, 常青青. 一种基于阶梯阈值的射线违禁品探测方法[J]. 原子核物理评论, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
引用本文: 陈勇, 常青青. 一种基于阶梯阈值的射线违禁品探测方法[J]. 原子核物理评论, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
CHEN Yong, CHANG Qingqing. A Step Threshold Based Method for γ-ray Contraband Detection[J]. Nuclear Physics Review, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
Citation: CHEN Yong, CHANG Qingqing. A Step Threshold Based Method for γ-ray Contraband Detection[J]. Nuclear Physics Review, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321

一种基于阶梯阈值的射线违禁品探测方法

doi: 10.11804/NuclPhysRev.33.03.321
基金项目: 国家重点研发计划(2016YFC0800904)
详细信息
    作者简介:

    陈勇(1969-),男,上海人,副研究员,主要从事核技术探测,违禁品识别处理;

    通讯作者: 常青青,E-mail:qingqingchang@163.com
  • 中图分类号: TL84

A Step Threshold Based Method for γ-ray Contraband Detection

Funds: National Key Research and Development Plan of China(2016YFC0800904)
  • 摘要: 在γ射线违禁品探测技术中,快速准确的γ射线康普顿散射信号平滑具有非常重要的意义。现有的多项式平滑法和小波分析方法不仅运算速度慢,且易受噪声干扰,容易出现弱峰、谱峰错位等问题。为解决上述问题,提出一种新的基于阶梯阈值的散射信号分析方法。首先通过数据预处理,计算康普顿散射信号的基底变量,然后根据自适应阶梯阈值和测量差值,依次迭代更新背散射数据,进行信号滤波,最后自动检测峰位,实现可疑物识别。实验结果表明,相比现有的信号分析方法,阶梯阈值算法能够降低噪声干扰,保留康普顿散射信号的峰值和峰位,运算速度快,满足便携式探测设备的实时性要求。

    Fast and accurate Compton scattering signal smoothing plays an important part for γ-ray-based contraband identification.Traditional methods based on polynomial averaging or wavelet analysis are not only slow but also sensitive to noise,which makes them suffer from issues such as peak amplitude decrease and peak dislocation.A new method based on step threshold is proposed for scattering signal analysis,which can overcome aforementioned issues.Firstly,the base value for Compton scattering signal is computed via data pre-processing.Secondly,the scattering data is iteratively updated using adaptive threshold and system measurement,thus producing smoothed signal data.At last,the peak is localized from the filtered signal data and abnormality is identified.Experimental results show that our method is robust against noise compared to existing methods.The amplitude and location of the peak can be accurately perceived and identified.The method is efficient and can be deployed on portable contraband detection devices.
  • [1] EBERHARDT J E,RAINEY S,STEVENS R J,et al.Applied Radiation&Isotopes Including Data Instrumentation&Methods for Use in Agriculture Industry&Medicine,2005,63(2):179.
    [2] DEHAAN D,DELESDERNIER D L.Hand-held contraband detector:US,US5068883 A[P].1990.
    [3] PANG Jufeng.γ-ray spectrum data analysize[M].Xi'an:Shanxi science and technique publishing press,1990.(in Chinese)(庞巨丰.γ能谱数据分析[M].西安:陕西科学技术出版社,1990.)
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    [7] PAN Quan,MENG Jinli,ZHANG Lei,et al.Wavelet Filtering Method and Its Application[J].Journal of Electronics&Information Technoloty.2007,29(1):236.(in Chinese)(潘泉,孟晋丽,张磊,等.电子与信息学报,2007,29(1):236)
    [8] HU Guangshu.Digital signal processing[M].Beijing:Tsinghua University Press,2003:93.(in Chinese)(胡广书.数据信号处理[M].北京:清华大学出版社,2003:93)
    [9] QU JianShi,WANG Jingyu.Multi-channel pulse analysis system[M].Beijing:Atomic Energy Press,1987:206.(in Chinese)(屈建石,王晶宇.多道脉冲分析系统原理[M].北京:原子能出版社,1987:206)
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出版历程
  • 收稿日期:  2015-09-14
  • 修回日期:  2015-11-27
  • 刊出日期:  2016-09-20

一种基于阶梯阈值的射线违禁品探测方法

doi: 10.11804/NuclPhysRev.33.03.321
    基金项目:  国家重点研发计划(2016YFC0800904)
    作者简介:

    陈勇(1969-),男,上海人,副研究员,主要从事核技术探测,违禁品识别处理;

    通讯作者: 常青青,E-mail:qingqingchang@163.com
  • 中图分类号: TL84

摘要: 在γ射线违禁品探测技术中,快速准确的γ射线康普顿散射信号平滑具有非常重要的意义。现有的多项式平滑法和小波分析方法不仅运算速度慢,且易受噪声干扰,容易出现弱峰、谱峰错位等问题。为解决上述问题,提出一种新的基于阶梯阈值的散射信号分析方法。首先通过数据预处理,计算康普顿散射信号的基底变量,然后根据自适应阶梯阈值和测量差值,依次迭代更新背散射数据,进行信号滤波,最后自动检测峰位,实现可疑物识别。实验结果表明,相比现有的信号分析方法,阶梯阈值算法能够降低噪声干扰,保留康普顿散射信号的峰值和峰位,运算速度快,满足便携式探测设备的实时性要求。

Fast and accurate Compton scattering signal smoothing plays an important part for γ-ray-based contraband identification.Traditional methods based on polynomial averaging or wavelet analysis are not only slow but also sensitive to noise,which makes them suffer from issues such as peak amplitude decrease and peak dislocation.A new method based on step threshold is proposed for scattering signal analysis,which can overcome aforementioned issues.Firstly,the base value for Compton scattering signal is computed via data pre-processing.Secondly,the scattering data is iteratively updated using adaptive threshold and system measurement,thus producing smoothed signal data.At last,the peak is localized from the filtered signal data and abnormality is identified.Experimental results show that our method is robust against noise compared to existing methods.The amplitude and location of the peak can be accurately perceived and identified.The method is efficient and can be deployed on portable contraband detection devices.

English Abstract

陈勇, 常青青. 一种基于阶梯阈值的射线违禁品探测方法[J]. 原子核物理评论, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
引用本文: 陈勇, 常青青. 一种基于阶梯阈值的射线违禁品探测方法[J]. 原子核物理评论, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
CHEN Yong, CHANG Qingqing. A Step Threshold Based Method for γ-ray Contraband Detection[J]. Nuclear Physics Review, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
Citation: CHEN Yong, CHANG Qingqing. A Step Threshold Based Method for γ-ray Contraband Detection[J]. Nuclear Physics Review, 2016, 33(3): 321-325. doi: 10.11804/NuclPhysRev.33.03.321
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