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Type: Journal article
Title: Temperature imaging of mobile BaMgAl10O17:Eu phosphor aggregates under high radiation flux
Author: Zhao, W.
Kueh, K.C.Y.
Nathan, G.J.
Alwahabi, Z.T.
Citation: Optics and Lasers in Engineering, 2021; 137:1-8
Publisher: Elsevier
Issue Date: 2021
ISSN: 0143-8166
Statement of
Wanxia Zhao, Kimberley C.Y.Kueh, Graham J.Nathan, Zeyad T.Alwahabi
Abstract: Planar laser-induced phosphorescence (PLIP) has been used for the temperature measurement of suspended phosphor aggregates. Two-dimensional surface temperature of fluidized phosphor aggregates was measured through a pair of spatial and wavelength resolved images in an environment where phosphors are heated by high-flux radiation. The heating was supplied by a multi-diode laser system which provides a well-characterized high-flux radiation up to 28.87 MW/m2. Phosphors made of BaMgAl10O17:Eu (BAM) were selected as the material and suspended in a fluidized bed. Single-shot temperature imaging of BAM aggregates were inferred and compared at several heat fluxes. With the increasing heat flux up to 28.87 MW/m2, the BAM aggregates were found to exhibit a wider range of temperature distribution, and the maximum average aggregate temperature achieved 723 K, while the maximum temperature of a single aggregate could reach up to 1063 K. The wider temperature distributions that observed under higher radiation fluxes were caused by the elevated temperature of cooling air and the non-uniform aggregate surfaces. This non-intrusive method of measuring temperature offers advantages over other available methods in the study of heat transfer processes involving high-temperature reactions.
Keywords: Planar temperature imaging of suspended aggregates; laser-induced phosphorescence (LIP); thermographic phosphors; homogeneous radiation heating
Rights: Crown Copyright © 2020 Published by Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.optlaseng.2020.106398
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