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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Surface area and volume measurements of volcanic ash particles using micro-computed tomography (micro-CT): A comparison with scanning electron microscope (SEM) stereoscopic imaging and geometric considerations
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Surface area and volume measurements of volcanic ash particles using micro-computed tomography (micro-CT): A comparison with scanning electron microscope (SEM) stereoscopic imaging and geometric considerations

机译：使用微计算机断层扫描（micro-CT）测量火山灰颗粒的表面积和体积：与扫描电子显微镜（SEM）立体成像的比较和几何考虑

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Volcanic ash particles are important components of explosive eruptions, and their surface textures are the subject of intense research. Characterization of ash surfaces is crucial for understanding the physics of volcanic plumes, remote sensing measurements of ash and aerosols, interfacial processes, modelling transportation and deposition of tephra and characterizing eruptive styles. A number of different methods have been used over the years to arrive at surface area estimates. The more common methods include estimates based on geometric considerations (geometric surface area) and physisorption of gas molecules on the surface of interest (physical surface area). In this study, micro computed tomography (micro-CT), which is a non-destructive method providing three-dimensional data, enabled the measurement of surface area and volume of individual ash particles. Results were compared with the values obtained from SEM stereoscopic imaging and geometric considerations. Surface area estimates of micro-CT and SEM stereoscopic imaging are similar, with surface area/volume ratios (SA/V) of 0.0368 and 0.0467, respectively. Ash particle surface textures show a large deviation from that of simple geometric forms, and an approximation both to spheres and ellipsoids do not seem adequate for the representation of ash surface. SEM stereoscopic and/or micro-CT imaging are here suggested as good candidate techniques for the characterization of textures on macro-pore regions of ash particles.
机译：火山灰颗粒是爆炸爆发的重要组成部分，其表面纹理是深入研究的主题。灰烬表面的表征对于理解火山羽的物理特性，灰烬和气溶胶的遥感测量，界面过程，对特菲拉的运输和沉积进行建模以及表征喷发样式至关重要。这些年来，已经使用了许多不同的方法来得出表面积估计值。更常见的方法包括基于几何考虑因素（几何表面积）和目标表面上气体分子的物理吸附（物理表面积）进行估算。在这项研究中，微计算机断层扫描（micro-CT）是一种提供三维数据的非破坏性方法，可以测量单个灰烬颗粒的表面积和体积。将结果与从SEM立体成像和几何考虑因素获得的值进行比较。微型CT和SEM立体成像的表面积估计值相似，表面积/体积比（SA / V）分别为0.0368和0.0467。烟灰颗粒的表面纹理显示出与简单几何形式的偏差很大，并且球体和椭球的近似值似乎不足以表示灰烬表面。在此建议将SEM立体和/或micro-CT成像作为表征灰分颗粒大孔区域纹理的良好候选技术。

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