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

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

doi:10.1088/0957-0233/27/11/115103

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

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

Mechanical And Aerospace Engineering

Research output: Contribution to journal › Article

3 Citations (Scopus)

83 Downloads (Pure)

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.

Original language	English
Article number	115103
Number of pages	9
Journal	Measurement Science and Technology
Volume	27
Issue number	11
Early online date	22 Sep 2016
DOIs	https://doi.org/10.1088/0957-0233/27/11/115103
Publication status	Published - 30 Nov 2016

Fingerprint

Phosphor

Rare Earths

Oxidation

Phosphors

Rare earths

phosphors

Coating

rare earth elements

histories

coatings

Coatings

Sensor

oxidation

sensors

Sensors

Ions

ionic diffusion

ions

Temperature

temperature

Keywords

phosphorescence
temperature measurement
thermal history sensor
thermal paints
gases
energy efficiency
thermographic phosphors

Cite this

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), [115103]. https://doi.org/10.1088/0957-0233/27/11/115103

Yáñez-González, Álvaro ; Ruiz-Trejo, Enrique ; Van Wachem, Berend ; Skinner, Stephen ; Beyrau, Frank ; Heyes, Andrew. / Development of an optical thermal history coating sensor based on the oxidation of a divalent rare earth ion phosphor. In: Measurement Science and Technology. 2016 ; Vol. 27, No. 11.

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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.",

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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, vol. 27, no. 11, 115103. https://doi.org/10.1088/0957-0233/27/11/115103

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.

In: Measurement Science and Technology, Vol. 27, No. 11, 115103, 30.11.2016.

Research output: Contribution to journal › Article

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AU - Skinner, Stephen

AU - Beyrau, Frank

AU - Heyes, Andrew

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