Harke Kathryn J, Armstrong Michael R, Martinez David, Lind Jonathan, Kumar Mukul
Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA, 94550, USA.
Sci Rep. 2024 Oct 26;14(1):25580. doi: 10.1038/s41598-024-76444-4.
Time-integrated radiography using MeV Bremsstrahlung X-ray sources is the norm for imaging during system-level testing of components and structures under dynamic condition. One source of error in the analysis of the time-integrated radiography data sets stems from motion blur which smears out sharp interfaces to a greater degree with longer exposure times, which become necessary to provide sufficient signal-to-noise with low X-ray penetration of objects of interest. To quantify motion blur, a 1D shock wave through PMMA was investigated experimentally at The Dynamic Compression Sector at The Advanced Photon Source (DCS@APS) with tapered broadband and 25.46 ± 1.06 keV narrowband X-rays. Four cameras with different exposure times were used for each experiment to compare the effect that exposure time has on motion blur. In addition, our methodology to accurately simulate motion blur in terms of transmission and shape is presented and compared to our experimental results and quantified. There is a high level of agreement between the experimental and simulation results across the range of data sets investigated in this study with a percent difference range of 0.29-1.31% for the four shots. The methodology of this work serves as a steppingstone towards a physically validated model that could be used in conjunction with experimental results to deconvolve physical parameters, densities, and interfaces of interest in a way that would not be possible with experimental results alone.
使用兆电子伏特轫致辐射X射线源的时间积分射线照相法是在动态条件下对部件和结构进行系统级测试期间成像的标准方法。时间积分射线照相数据集分析中的一个误差源来自运动模糊，随着曝光时间延长，运动模糊会更严重地模糊清晰的界面，而对于感兴趣的低X射线穿透物体，为了提供足够的信噪比，较长的曝光时间变得必要。为了量化运动模糊，在先进光子源的动态压缩部门（DCS@APS），利用锥形宽带和25.46±1.06 keV窄带X射线对穿过聚甲基丙烯酸甲酯（PMMA）的一维冲击波进行了实验研究。每次实验使用四个具有不同曝光时间的相机，以比较曝光时间对运动模糊的影响。此外，还介绍了我们在透射和形状方面精确模拟运动模糊的方法，并与我们的实验结果进行比较和量化。在本研究调查的数据集范围内，实验结果与模拟结果高度一致，四次拍摄的百分比差异范围为0.29-1.31%。这项工作的方法是迈向物理验证模型的垫脚石，该模型可与实验结果结合使用，以反卷积感兴趣的物理参数、密度和界面，而仅靠实验结果是无法做到这一点的。
