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Development of an optical thermal history coating sensor based on the oxidation of a divalent rare earth ion phosphor

Yáñez-González, Álvaro; Ruiz-Trejo, Enrique; van Wachem, Berend; Skinner, Stephen; Beyrau, Frank; Heyes, Andrew

Authors

Álvaro Yáñez-González

Enrique Ruiz-Trejo

Berend van Wachem

Stephen Skinner

Frank Beyrau

Andrew Heyes



Abstract

The measurement of temperatures in gas turbines, boilers, heat exchangers and other components exposed to hot gases is essential to design energy efficient systems and improve maintenance procedures. When on-line measurements, such as those performed with thermocouples and pyrometers, are not possible or inconvenient, the maximum temperatures of operation can be recorded and measured off-line after operation. Although thermal paints have been used for many years for this purpose, a novel technique based on irreversible changes in the optical properties of thermographic phosphors, can overcome some of the disadvantages of previous methods.

In particular, oxidation of the divalent rare earth ion phosphor BaMgAl10O17:Eu (BAM:Eu) has shown great potential for temperature sensing between 700 °C and 1200 °C. The emission spectra of this phosphor change with temperature, which permits to define an intensity ratio between different lines in the spectra that can be used as a measurand of the temperature. In this paper, the study of the sensing capabilities of a sensor coating based on BAM:Eu phosphor material is addressed for the first time. The sensitivity of the intensity ratio is investigated in the temperature range from 800 °C to 1100 °C, and is proved to be affected by ionic diffusion of transition metals from the substrate. The use of an interlayer made of zirconia proves efficient in reducing ionic diffusion and coatings with this diffusion barrier present sensitivity comparable to that of the powder material.

Citation

Yáñez-González, Á., Ruiz-Trejo, E., van Wachem, B., Skinner, S., Beyrau, F., & Heyes, A. (2016). Development of an optical thermal history coating sensor based on the oxidation of a divalent rare earth ion phosphor. Measurement Science and Technology, 27(11), Article 115103. https://doi.org/10.1088/0957-0233/27/11/115103

Journal Article Type Article
Acceptance Date Aug 24, 2016
Online Publication Date Sep 22, 2016
Publication Date 2016-11
Deposit Date Feb 8, 2021
Publicly Available Date Feb 8, 2021
Journal Measurement Science and Technology
Print ISSN 0957-0233
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 27
Issue 11
Article Number 115103
DOI https://doi.org/10.1088/0957-0233/27/11/115103
Keywords Instrumentation; Applied Mathematics
Public URL https://hull-repository.worktribe.com/output/3713542
Publisher URL https://iopscience.iop.org/article/10.1088/0957-0233/27/11/115103
Related Public URLs https://strathprints.strath.ac.uk/58762/
Additional Information Journal title: Measurement Science and Technology; Article type: paper; Article title: Development of an optical thermal history coating sensor based on the oxidation of a divalent rare earth ion phosphor; Copyright information: © 2016 IOP Publishing Ltd; Date received: 2016-03-12; Date accepted: 2016-08-24; Online publication date: 2016-09-22

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©2020 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder






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