Neutron tomography of particulate filters: a non-destructive investigation tool for applied and industrial research
Neutron tomography of particulate filters: a non-destructive investigation tool for applied and industrial research
复制标题
颗粒过滤器的中子断层扫描：用于应用和工业研究的无损调查工具
DOI：
10.1016/j.nima.2013.08.033
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发表时间：
2013
影响因子：
1.4
通讯作者：
J. Pihl
中科院分区：
文献类型：
--
作者：
T. Toops;H. Bilheux;S. Voisin;J. Gregor;L. Walker;A. Strzelec;C. Finney;J. Pihl
本研究描述了高保真中子成像的发展和实施以及图像的相关分析。这种先进的功能允许对颗粒过滤器（PF）进行非破坏性、非侵入性成像，以及颗粒和催化涂层如何在过滤器内沉积。这里描述的大部分工作是在橡树岭国家实验室的高通量同位素反应堆（HFIR）CG-1D中子成像束线上进行的;目前的空间分辨率约为50 μm。样品保持器配备有允许3D成像（即，当与计算机化重建工具结合时，可以对样品进行计算机断层扫描）。使中子图像成为可能的是某些元素吸收或散射中子的能力，而其他元素允许中子以可忽略的相互作用穿过它们。在这项研究中特别感兴趣的是中子的散射含氢分子，如碳氢化合物（HC）和/或水，吸附到烟灰，灰尘和催化涂层的表面。即便如此，这种吸附水/HC的相互作用是低的，需要计算技术，以提高对比度，主要是一个修改的同时迭代重建技术（SIRT）。该努力描述了以下系统：颗粒随机分布在PF中，PF中的灰分沉积，PF中的催化洗涂层，以及SiC PF中的三种颗粒负载。
This research describes the development and implementation of high-fidelity neutron imaging and the associated analysis of the images. This advanced capability allows the non-destructive, non-invasive imaging of particulate filters (PFs) and how the deposition of particulate and catalytic washcoat occurs within the filter. The majority of the efforts described here were performed at the High Flux Isotope Reactor (HFIR) CG-1D neutron imaging beamline at Oak Ridge National Laboratory; the current spatial resolution is approximately 50 μm. The sample holder is equipped with a high-precision rotation stage that allows 3D imaging (i.e., computed tomography) of the sample when combined with computerized reconstruction tools. What enables the neutron-based image is the ability of some elements to absorb or scatter neutrons where other elements allow the neutron to pass through them with negligible interaction. Of particular interest in this study is the scattering of neutrons by hydrogen-containing molecules, such as hydrocarbons (HCs) and/or water, which are adsorbed to the surface of soot, ash and catalytic washcoat. Even so, the interactions with this adsorbed water/HC is low and computational techniques were required to enhance the contrast, primarily a modified simultaneous iterative reconstruction technique (SIRT). This effort describes the following systems: particulate randomly distributed in a PF, ash deposition in PFs, a catalyzed washcoat layer in a PF, and three particulate loadings in a SiC PF.