{"title":"A new LED-based extinction tomography method for measurement of aerosol surface area","authors":"Liam Milton-McGurk , Agisilaos Kourmatzis , Hak-Kim Chan , Shaokoon Cheng , Assaad R. Masri , Dino Farina","doi":"10.1016/j.jaerosci.2024.106432","DOIUrl":null,"url":null,"abstract":"<div><p>A light-emitting-diode (LED) based optical technique is developed to measure the surface area per unit volume of particles in aerosols and liquid sprays. The technique uses path-integrated measurements of transmittance, <em>T</em>, from two angles to produce a tomographic reconstruction of the local extinction coefficients, <em>K</em>, in the region of interest, using the Beer-Lambert law and a deconvolution algorithm. When the particles in the flow have sufficiently large diameters (existing in the Mie scattering regime), these extinction coefficients can be related to the surface area per unit volume of the particles. The technique has the potential to be applied to a wide range of two-phase flows. In the present study, it is applied to flows through a pharmaceutical inhaler device, where two powders with different particle size distributions are considered.</p></div>","PeriodicalId":14880,"journal":{"name":"Journal of Aerosol Science","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0021850224000995/pdfft?md5=8cbeb2c02ecae7df5d33afab932bcd0d&pid=1-s2.0-S0021850224000995-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Aerosol Science","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0021850224000995","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
A light-emitting-diode (LED) based optical technique is developed to measure the surface area per unit volume of particles in aerosols and liquid sprays. The technique uses path-integrated measurements of transmittance, T, from two angles to produce a tomographic reconstruction of the local extinction coefficients, K, in the region of interest, using the Beer-Lambert law and a deconvolution algorithm. When the particles in the flow have sufficiently large diameters (existing in the Mie scattering regime), these extinction coefficients can be related to the surface area per unit volume of the particles. The technique has the potential to be applied to a wide range of two-phase flows. In the present study, it is applied to flows through a pharmaceutical inhaler device, where two powders with different particle size distributions are considered.
开发了一种基于发光二极管（LED）的光学技术，用于测量气溶胶和液体喷雾中颗粒的单位体积表面积。该技术利用比尔-朗伯定律和解卷积算法，从两个角度对透射率 T 进行路径积分测量，从而对相关区域的局部消光系数 K 进行层析重建。当流动中的颗粒直径足够大时（存在于米氏散射体系中），这些消光系数可与颗粒单位体积的表面积相关联。该技术可应用于多种两相流。本研究将其应用于流经药物吸入器装置的流动，其中考虑了两种具有不同粒度分布的粉末。
期刊介绍：
Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences.
The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics:
1. Fundamental Aerosol Science.
2. Applied Aerosol Science.
3. Instrumentation & Measurement Methods.
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