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Evaluation of measurement uncertainties of digital volume correlation applied to laminography data

机译:评估数字量相关性在X射线照相数据上的测量不确定度

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摘要

The effect of different data acquisition parameters on the displacement and strain uncertainties of kinematic fields is assessed via digital volume correlation applied to three-dimensional data sets imaged by synchrotron laminography. The measurement uncertainty is estimated for (1) different materials and associated varying contrast; (2) repeated scans, that is, uncertainty due to the imaging system and three-dimensional reconstruction; (3) rigid body motions between two subsequent scans; (4) rescaling of the gray level histogram during 32-bit floating point to 8-bit integer data conversion; (5) changes in the beam properties, that is, use of a monochromator or an undulator; and (6) changes in camera/detector characteristics. It is found that the amount of image contrast is not the only parameter that controls uncertainties for different materials. Furthermore, the rigid body motion procedure should be preferred over repeated scans as it provides more conservative measurement uncertainty values. The applied 32- to 8-bit conversion procedure, beam tuning and detector characteristics hardly affect the measurement uncertainty.
机译:通过将数字体积相关性应用于同步加速器X射线成像成像的三维数据集,可以评估不同数据采集参数对运动场位移和应变不确定性的影响。 (1)不同材料和相关的变化对比度估计测量不确定度; (2)重复扫描,即由于成像系统和三维重建而导致的不确定性; (3)两次后续扫描之间的刚体运动; (4)将32位浮点数转换为8位整数数据时将灰度直方图缩放。 (5)改变光束特性,即使用单色仪或波荡器; (6)相机/探测器特性的变化。发现图像对比度的量不是控制不同材料的不确定性的唯一参数。此外,与重复扫描相比,应首选刚体运动程序,因为它提供了更为保守的测量不确定度值。应用的32位到8位转换过程,光束调谐和检测器特性几乎不会影响测量不确定度。

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