Spatial resolution of a laboratory based X-Ray cone-beam laminography scanning system for various trajectories
Spatial resolution of a laboratory based X-Ray cone-beam laminography scanning system for various trajectories
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DOI：
10.1016/j.ndteint.2020.102222
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发表时间：
2020-04-01
影响因子：
4.2
通讯作者：
Blumensath, Thomas
中科院分区：
文献类型：
--
作者：
Deyhle, Hans;Towsyfyan, Hossein;Blumensath, Thomas
计算机断层扫描（CL）是一种历史悠久的无损检测方法，是理想的板状结构的非破坏性评估，其中传统的计算机断层扫描（CT）是不太适合。本文演示了在尼康Metrology定制X射线CT扫描仪上实现光栅CL的可行性，而无需专门的设备。为了提供一种更有原则的方法来证明CL在板状结构缺陷表征中的广泛采用，用聚甲醛（Delrin）设计并制造了一个测试样本，该样本允许表征不同尺寸和方向的明确特征。该研究突出了方向相关的空间分辨率，特征几何形状和扫描轨迹之间的关系。它表明，具有大纵横比的板状结构的高分辨率和高速原位体积成像是可行的，通过CT或替代的三维NDT方法具有挑战性。
Computed laminography (CL), a long established NDT method, is ideal for the non-destructive evaluation of plate-like structures, for which conventional computed tomography (CT) is less well suited. This paper demonstrates the feasibility of implementing raster CL on a Nikon Metrology custom build X-ray CT scanner without the need for specialised equipment. To provide a more principled way to demonstrate the widespread adoption of CL for defect characterization in plate-like structures, a test specimen was designed and manufactured from Polyoxymethylene (Delrin) that allows well defined features of different size and orientation to be characterized. The study highlights the relation between direction-dependent spatial resolution, feature geometry and scan trajectory. It demonstrates that high-resolution and high-speed in situ volume-imaging of plate-like structures with large aspect ratios is viable at levels that would be challenging via CT or alternative three-dimensional NDT methods.