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

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Title: Development of an optical thermal history coating sensor based on the oxidation of a divalent rare earth ion phosphor
Authors: Skinner, SJ
Yanez-Gonzalez, A
Ruiz-Trejo, E
Van Wachem, B
Beyrau, F
Heyes, A
Item Type: Journal Article
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.
Issue Date: 22-Sep-2016
Date of Acceptance: 24-Aug-2016
URI: http://hdl.handle.net/10044/1/39552
DOI: http://dx.doi.org/10.1088/0957-0233/27/11/115103
ISSN: 1361-6501
Publisher: IOP Publishing
Journal / Book Title: Measurement Science & Technology
Volume: 27
Issue: 11
Copyright Statement: © 2016 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Measurement Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at http://dx.doi.org/10.1088/0957-0233/27/11/115103.
Keywords: Optics
Physical Sciences
Publication Status: Published
Article Number: 115103
Appears in Collections:Mechanical Engineering
Faculty of Natural Sciences
Faculty of Engineering