Energy selective neutron radiography in material research
Energy selective neutron radiography in material research
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DOI：
10.1007/s00339-010-5602-7
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
L. Josic;A. Steuwer;E. Lehmann
中科院分区：
文献类型：
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作者：
L. Josic;A. Steuwer;E. Lehmann
用能量选择中子射线照相技术描述了多晶材料中的复杂结构。实验采用双晶单色仪从最初的多色中子束中选择窄能带，中子吸收闪烁屏与冷却CCD相机耦合作为检测系统，同时实现了目前最高的能量和空间分辨率。结果表明，在冷能范围内进行能量选择中子成像可以对焊接钢试样的详细结构进行可视化和量化，在冷能范围内，弹性相干散射主导了试样的总截面，呈现出特征的布拉格边缘。通过射线照相直接获得的样品面积为~ 2×2 cm2，厚度为~ 11.2 mm的晶体取向图，该复杂结构的能量分辨率为~ 50 μm。
Energy selective neutron radiography was performed to describe a complex structure in polycrystalline materials. Experiments were performed with currently the highest energy and spatial resolutions achieved simultaneously, by employing a double crystal monochromator for selecting narrow energy bands from the initially polychromatic neutron beam and the neutron absorbing scintillator screen coupled with the cooled CCD camera as a detection system. It was shown that the detailed structure of the welded steel sample can be visualized and quantified by performing energy selective neutron imaging in the cold energy range, where elastic coherent scattering dominates the total cross section of the sample, showing characteristic Bragg edges. With the maps of crystallographic orientations over the sample area of ∼2×2 cm2and thickness ∼11.2 mm, obtained directly from radiographs, the complex structure was energy resolved with a spatial resolution of ∼50 μm.