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闪光照相散射定量技术初步研究

贾清刚 毛朋成 王文远 孔令海 杨波 许海波

贾清刚, 毛朋成, 王文远, 等. 闪光照相散射定量技术初步研究[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.210488
引用本文: 贾清刚, 毛朋成, 王文远, 等. 闪光照相散射定量技术初步研究[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.210488
Jia Qinggang, Mao Pengcheng, Wang Wenyuan, et al. Preliminary study on scatter quantification method for flash Multi-MeV radiography[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.210488
Citation: Jia Qinggang, Mao Pengcheng, Wang Wenyuan, et al. Preliminary study on scatter quantification method for flash Multi-MeV radiography[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.210488

闪光照相散射定量技术初步研究

doi: 10.11884/HPLPB202234.210488
基金项目: 国家自然科学基金项目(11805018)
详细信息
    作者简介:

    贾清刚,jia_qinggang@iapcm.ac.cn

  • 中图分类号: O438.1

Preliminary study on scatter quantification method for flash Multi-MeV radiography

  • 摘要: 高能MeV闪光照相所针对的客体通常具有极高的面密度。当X射线穿过客体时,直穿X射线的强度将被极大衰减,到达成像面的直穿信号可能被散射“噪声”所淹没,若直接对图像进行反演将严重影响照相重建精度。从散射抑制角度出发,目前主要采用网柵相机即阵列型准直孔阻挡散射,但网栅相机的应用效果受光源位置稳定性影响较大,且网栅不易加工。本文提出了一种可实时定量散射强度的照相方案,该方案利用狭缝准直器对散射的抑制能力不随散射强度变化而改变这一特点,对现有照相布局进行小改进,利用已知客体实验结果标定狭缝准直器对散射的抑制能力,进一步自洽确定待测客体的散射量大小。基于蒙卡方法的仿真照相实验结果表明,当采用低面密度客体标定参数时,高面密度客体散射强度的估计值与模拟真实值偏差可小于2%。
  • 图  1  闪光照相基本布局及改进方案

    Figure  1.  Basic layout and improvement plan of flash radiography

    图  2  假设变密度FTO-Den一维密度分布

    Figure  2.  One-dimensional density distributions of FTO-like objects

    图  3  蒙特卡罗模拟含倒准直变密度FTO-U35照相直穿散射分布

    Figure  3.  The primary and scatter X-ray distribution of FTO-U35 with inverted collimation

    图  4  阵列屏及狭缝准直后FTO35照相预期强度分布

    Figure  4.  The expected intensity distribution of FTO35 at the 2D array and downstream slit

    图  5  阵列屏及调整后狭缝准FTO35照相预期强度分布

    Figure  5.  The expected intensity distribution of the array screen and the adjusted slit quasi-FTO35 photography

    图  6  FTO-U30照相狭缝准直前后直穿及散射强度分布

    Figure  6.  FTO-U30 camera slit straight through and scattering intensity distribution before and after collimation

    图  7  FTO-U40照相狭缝准直前后直穿及散射强度分布

    Figure  7.  FTO-U40 camera slit straight through and scattering intensity distribution before and after collimation

    图  8  FTO-U45照相狭缝准直前后直穿及散射强度分布

    Figure  8.  FTO-U45 photographic slit straight-through and scattering intensity distribution before and after collimation

    图  9  阵列准直器可视化横断面示意图

    Figure  9.  Schematic diagram of the visualized cross-section of the array collimator

    表  1  采用FTO-U30客体标定R用于估计其余客体散射值

    Table  1.   Calibration of R by FTO-U30 object to estimate the scattering value of other objects

    object namevariation before and after slit
    collimation (measurement)
    simulated
    scatter value
    calculated
    scatter value
    scatter after
    collimation (simulation)
    Rrelative
    deviation/%
    FTO-U30(For calibration) 0.0294 0.064 0.0059 0.0975
    FTO-U40 0.035 0.055 0.056 0.0975 +1.8
    FTO-U45 0.035 0.055 0.056 0.0975 +1.8
    下载: 导出CSV

    表  2  采用FTO-U45客体标定R用于估计其余客体散射值

    Table  2.   Calibration of R by FTO-U45 object to estimate the scattering value of other objects

    Object nameVariation before and after slit
    collimation (measurement)
    Simulated
    scatter value
    Calculated
    scatter value
    Scatter after
    collimation (simulation)
    RRelative
    deviation/%
    FTO-U45(For calibration) 0.0354 0.055 0.0052 0.0945
    FTO-U30 0.0294 0.062 0.046 0.0945 −25.6
    FTO-U35 0.034 0.060 0.053 0.0945 −11.7
    下载: 导出CSV
  • [1] 施将君, 刘军, 刘进, 等. 闪光照相中源尺寸和散射对成像的影响[J]. 强激光与粒子束, 2006, 18(10):1727-1730. (Shi Jiangjun, Liu Jun, Liu Jin, et al. Effects of source spot size and scatter on imaging in radiography[J]. High Power Laser and Particle Beams, 2006, 18(10): 1727-1730

    Shi Jiangjun, Liu Jun, Liu Jin, et al. Effects of source spot size and scatter on imaging in radiography[J]. High Power Laser and Particle Beams, 2006, 18(10): 1727-1730
    [2] 刘军, 张绚, 刘进, 等. 闪光照相中散射分布均匀性的影响因素[J]. 强激光与粒子束, 2009, 21(3):447-450. (Liu Jun, Zhang Xuan, Liu Jin, et al. Factors affecting scatter uniformity in flash X-ray radiography[J]. High Power Laser and Particle Beams, 2009, 21(3): 447-450

    Liu Jun, Zhang Xuan, Liu Jin, et al. Factors affecting scatter uniformity in flash X-ray radiography[J]. High Power Laser and Particle Beams, 2009, 21(3): 447-450
    [3] Liu Jin, Liu Jun, Jing Yuefeng, et al. Decreasing the scatter effect in density reconstruction in high-energy x-ray radiography[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2013, 716: 86-89.
    [4] Cao Liangzhi, Wang Mengqi, Wu Hongchun, et al. Scattering correction for image reconstruction in flash radiography[J]. Nuclear Engineering and Technology, 2013, 45(4): 529-538. doi: 10.5516/NET.08.2012.074
    [5] 刘军, 张绚, 刘进, 等. 高能闪光照相中网栅相机的性能分析[J]. 强激光与粒子束, 2016, 28:024003. (Liu Jun, Zhang Xuan, Liu Jin, et al. Performance analysis of anti-scatter grid camera in high energy flash radiography[J]. High Power Laser and Particle Beams, 2016, 28: 024003 doi: 10.11884/HPLPB201628.024003

    Liu Jun, Zhang Xuan, Liu Jin, et al. Performance analysis of anti-scatter grid camera in high energy flash radiography[J]. High Power Laser and Particle Beams, 2016, 28: 024003 doi: 10.11884/HPLPB201628.024003
    [6] Deng Li, Li Gang, Zhang Baoyin, et al. JMCT monte Carlo code with capability of integrating nuclear system feedback[C]//Proceedings of the 2018 2nd International Conference on Applied Mathematics, Modelling and Statistics Application (AMMSA 2018). 2018: 48-54.
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出版历程
  • 收稿日期:  2021-11-12
  • 录用日期:  2022-07-07
  • 修回日期:  2022-06-04
  • 网络出版日期:  2022-07-08

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