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移动光束衍射几何学:一个衍射扫描探头的DIAD应用
Alberto Leonardi1, Andrew James1, Christina Reinhard2,3
1Physical Sciences Diamond Light Source Diamond House - Harwell Science and Innovation Campus Didcot OxfordshireOX11 0DE United Kingdom.
概括
双成像和衍射 (DIAD) 光线线使用一种新的移动光束衍射几何学来进行精确的材料分析. 这种技术在实验中准确量化微观结构,应变和相位变化,这对于能源和生物医学应用至关重要.
科学领域:
- 材料科学与工程 材料科学与工程
- 同步射线辐射技术 同步射线辐射技术
- 纳米技术和先进材料
背景情况:
- 量化材料的行为 (微观结构,应变,相位) 对于储能,碳捕获和生物医学工程至关重要.
- 现有的方法需要多个仪器,导致数据的空间和时间分离.
- 钻石光源的双成像和衍射 (DIAD) 束线旨在克服这些局限性.
研究的目的:
- 在DIAD光线线上引入和验证一种新的移动光束衍射几何.
- 评估该技术的几何校准和数据减少程序的可靠性.
- 为光线线用户提供移动光束衍射几何学的定量评估.
主要方法:
- 通过两个独立的光束利用了近似同时的X射线计算机断层扫描和X射线粉碎衍射.
- 实现了"图像引导衍射"模式,使用扫描微米大小的衍射束.
- 对移动光束衍射几何学校准和数据缩小进行了定量评估.
主要成果:
- 移动光束衍射几何在传统传输探测器几何中最敏感.
- 柯克帕特里克-贝兹镜像运动导致射线探测器的刚性转换,而不会改变入射射线的角度.
- 最近邻校准的准确性与小样本区域距离的自我校准相美.
- 移动光束衍射几何学的绝对误差仍然低于0.01%.
结论:
- 在DIAD的新型移动光束衍射几何学允许精确的,空间相关的测量.
- 这种技术可用于研究快速演变和运动敏感的过程和样本.
- 经过验证的几何和校准方法为DIAD用户提供了宝贵的参考.
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