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Numerical Study of Near-Infrared Light Propagation in Aqueous Alumina Suspensions Using the Steady-State Radiative Transfer Equation and Dependent Scattering Theory
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| Title: | Numerical Study of Near-Infrared Light Propagation in Aqueous Alumina Suspensions Using the Steady-State Radiative Transfer Equation and Dependent Scattering Theory |
| Authors: | Fujii, Hiroyuki Browse this author →KAKEN DB | | Terabayashi, Iori Browse this author | | Aoki, Toshiaki Browse this author | | Inoue, Yuki Browse this author | | Na, Hyeonwoo Browse this author | | Kobayashi, Kazumichi Browse this author →KAKEN DB | | Watanabe, Masao Browse this author →KAKEN DB |
| Keywords: | near-infrared imaging and spectroscopy | | light propagation model | | liquid phantom | | radiative transfer equation | | photon diffusion equation |
| Issue Date: | 24-Jan-2022 |
| Publisher: | MDPI |
| Journal Title: | Applied Sciences |
| Volume: | 12 |
| Issue: | 3 |
| Start Page: | 1190 |
| Publisher DOI: | 10.3390/app12031190 |
| Abstract: | Understanding light propagation in liquid phantoms, such as colloidal suspensions, involves fundamental research of near-infrared optical imaging and spectroscopy for biological tissues. Our objective is to numerically investigate light propagation in the alumina colloidal suspensions with the mean alumina particle diameter of 55 nm at the volume fraction range 1–20%. We calculated the light scattering properties using the dependent scattering theory (DST) on a length scale comparable to the optical wavelength. We calculated the steady-state radiative transfer and photon diffusion equations (RTE and PDE) using the DST results based on the finite difference method in a length scale of the mean free path. The DST calculations showed that the scattering and reduced scattering coefficients become more prominent at a higher volume fraction. The anisotropy factor is almost zero at all the volume fractions, meaning the scattering is isotropic. The comparative study of the RTE with the PDE showed that the diffusion approximation holds at the internal region with all the volume fractions and the boundary region with the volume fraction higher than 1%. Our findings suggest the usefulness of the PDE as a light propagation model for the alumina suspensions rather than the RTE, which provides accurate but complicated computation. |
| Rights: | © 2022 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). | | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/83932 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 藤井 宏之
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