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

Yáñez-González, Álvaro and Ruiz-Trejo, Enrique and Van Wachem, Berend and Skinner, Stephen and Beyrau, Frank and Heyes, Andrew (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). 115103. ISSN 0957-0233 (https://doi.org/10.1088/0957-0233/27/11/115103)

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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.

  • Item type:Article
    ID code:58762
    Dates:
    Date
    Event
    30 November 2016
    Published
    22 September 2016
    Published Online
    24 August 2016
    Accepted
    Notes:“This is an author-created, un-copyedited version of an article accepted for publication in Measurement Science and Technology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/0957-0233/27/11/115103.”
    Subjects:Science > Physics
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:23 Nov 2016 10:46
    Last modified:21 Apr 2024 00:26
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/58762
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