A laboratory-based Laue X-ray diffraction system for enhanced imaging range and surface grain mapping.
A laboratory-based Laue X-ray diffraction system for enhanced imaging range and surface grain mapping.
复制标题
基于实验室的 Laue X 射线衍射系统，用于增强成像范围和表面颗粒映射。
DOI：
10.1107/s1600576715009097
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发表时间：
2015-08-01
影响因子：
6.1
通讯作者：
Huxley AD
中科院分区：
文献类型：
--
作者：
Whitley W;Stock C;Huxley AD
本发明描述了一种在实验室环境中使用电动样品台和CCD探测器对多晶样品进行自动颗粒制图的装置。在相对较小的表面上使用更快的检测器所带来的限制可以使用自动平移台来解决。虽然CCD x射线探测器可以更快地使用，但它们的大面积版本可能比类似尺寸的照相板探测器昂贵得多。当索引x射线衍射模式时，大面积探测器可以证明是非常有利的，因为它们提供更多的斑点，这使得拟合方向更容易。另一方面，当在多晶样品中寻找单晶时，CCD探测器的速度更有用。这里描述了一种新的设置，它克服了有限范围CCD探测器的一些局限性，使它们在索引时更有用，同时使其在更大的多晶结构中更快地找到单晶。这是通过将CCD探测器与六轴测角仪相结合来完成的，可以将不同角度的图像汇编成广角图像。沿着样品的自动扫描与图像处理技术相结合，产生颗粒图，然后可以用来提供从多晶中提取单晶的策略。
Apparatus is described for the purpose of automated grain mapping of polycrystalline samples within a laboratory environment, using a motorized sample stage and a CCD detector. The limitations that come from using a faster detector of relatively small surface are countered using an automated translation stage. Although CCD X-ray detectors can be faster to use, their large-area versions can be much more expensive than similarly sized photographic plate detectors. When indexing X-ray diffraction patterns, large-area detectors can prove very advantageous as they provide more spots, which makes fitting an orientation easier. On the other hand, when looking for single crystals in a polycrystalline sample, the speed of CCD detectors is more useful. A new setup is described here which overcomes some of the limitations of limited-range CCD detectors to make them more useful for indexing, whilst at the same time making it much quicker to find single crystals within a larger polycrystalline structure. This was done by combining a CCD detector with a six-axis goniometer, allowing the compilation of images from different angles into a wide-angled image. Automated scans along the sample were coupled with image processing techniques to produce grain maps, which can then be used to provide a strategy to extract single crystals from a polycrystal.