Evaluation of measurement uncertainties of digital volume correlation applied to laminography data
Evaluation of measurement uncertainties of digital volume correlation applied to laminography data
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DOI：
10.1177/0309324717748097
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发表时间：
2018-02-01
影响因子：
1.6
通讯作者：
Hild, Francois
中科院分区：
文献类型：
--
作者：
Buljac, Ante;Taillandier-Thomas, Thibault;Hild, Francois
不同的数据采集参数的位移和应变的不确定性的运动场的效果进行评估，通过数字体积相关应用到三维数据集同步辐射断层成像。测量不确定性是针对以下各项进行估计的：（1）不同的材料和相关的变化对比度;（2）重复扫描，即，由于成像系统和三维重建而引起的不确定性;（3）两次后续扫描之间的刚体运动;（4）在32位浮点到8位整数数据转换期间灰度级直方图的重新缩放;（5）在32位浮点到8位整数数据转换期间灰度级直方图的重新缩放。（5）光束特性的变化，即单色器或波荡器的使用;以及（6）照相机/检测器特性的变化。据发现，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，刚体运动程序应优于重复扫描，因为它提供了更保守的测量不确定性值。所应用的32位到8位的转换过程、光束调谐和探测器特性几乎不影响测量不确定度。
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.