High temperature thermographic phosphors YAG:Tm;Li and YAG:Dy in reduced oxygen environments
Nilsson, Sebastian LU ; Feuk, Henrik LU
and Richter, Mattias
LU
(2023)
In Journal of Luminescence
256.
- Abstract
Phosphor
thermometry for surface temperature measurements has become an
established remote thermometry technique. However, measuring at
temperatures above 1700 K is still challenging because of the weak
phosphorescence and intense background from black-body radiation,
leading to low signal-to-noise ratios. Therefore, lifetime-based
phosphor thermometry with YAG:Tm;Li and YAG:Dy for high-temperature
applications were investigated in this study with the aim of improving
the precision of high-temperature measurements. The phosphors were
coated on an alumina-oxide disc, which was placed in a
temperature-controlled oven that exposed the phosphors to temperatures
of up to 1930 K. The... (More)Phosphor
(Less)
thermometry for surface temperature measurements has become an
established remote thermometry technique. However, measuring at
temperatures above 1700 K is still challenging because of the weak
phosphorescence and intense background from black-body radiation,
leading to low signal-to-noise ratios. Therefore, lifetime-based
phosphor thermometry with YAG:Tm;Li and YAG:Dy for high-temperature
applications were investigated in this study with the aim of improving
the precision of high-temperature measurements. The phosphors were
coated on an alumina-oxide disc, which was placed in a
temperature-controlled oven that exposed the phosphors to temperatures
of up to 1930 K. The emission spectra and temporal decay of the
luminescence were recorded for the investigated phosphors including
their sensitivity to oxygen concentration in the gas environment.
Knowledge of oxygen environment sensitivities for measurements of
reduced oxygen concentrations at high temperatures, such as in
combustion, is of great importance to increase confidence in the
measurement. The results suggest that performing a mono-exponential
decay time fit in a region of the decay curve that is dominated by a
single lifetime component reduces the sensitivity to changes in the gas
oxygen concentration for YAG:Tm;Li. Moreover, YAG:Tm;Li performs better
than YAG:Dy in terms of signal-to-noise ratio (SNR), with a peak signal
value and SNR almost an order of magnitude higher. With an appropriate
decay curve fitting procedure, the effects of oxygen quenching can be
minimized, such that the measurement error due to oxygen quenching is
within the measurement precision for both phosphors.
- author
- Nilsson, Sebastian
LU
; Feuk, Henrik
LU
and Richter, Mattias
LU
- organization
- publishing date
- 2023-04
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Luminescence
- volume
- 256
- article number
- 119645
- pages
- 9 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85145020777
- ISSN
- 0022-2313
- DOI
- 10.1016/j.jlumin.2022.119645
- project
- HYdrogen as a FLEXible energy storage for a fully renewable European POWER system
- Advanced Laser Diagnostics for Discharge Plasma
- language
- English
- LU publication?
- yes
- id
- e8347de7-21f3-4b6e-9e3e-f2033fcec7e3
- date added to LUP
- 2022-12-29 14:37:57
- date last changed
- 2024-03-21 12:33:28
@article{e8347de7-21f3-4b6e-9e3e-f2033fcec7e3,
abstract = {{<p>Phosphor<br>
thermometry for surface temperature measurements has become an <br>
established remote thermometry technique. However, measuring at <br>
temperatures above 1700 K is still challenging because of the weak <br>
phosphorescence and intense background from black-body radiation, <br>
leading to low signal-to-noise ratios. Therefore, lifetime-based <br>
phosphor thermometry with YAG:Tm;Li and YAG:Dy for high-temperature <br>
applications were investigated in this study with the aim of improving <br>
the precision of high-temperature measurements. The phosphors were <br>
coated on an alumina-oxide disc, which was placed in a <br>
temperature-controlled oven that exposed the phosphors to temperatures <br>
of up to 1930 K. The emission spectra and temporal decay of the <br>
luminescence were recorded for the investigated phosphors including <br>
their sensitivity to oxygen concentration in the gas environment. <br>
Knowledge of oxygen environment sensitivities for measurements of <br>
reduced oxygen concentrations at high temperatures, such as in <br>
combustion, is of great importance to increase confidence in the <br>
measurement. The results suggest that performing a mono-exponential <br>
decay time fit in a region of the decay curve that is dominated by a <br>
single lifetime component reduces the sensitivity to changes in the gas <br>
oxygen concentration for YAG:Tm;Li. Moreover, YAG:Tm;Li performs better <br>
than YAG:Dy in terms of signal-to-noise ratio (SNR), with a peak signal <br>
value and SNR almost an order of magnitude higher. With an appropriate <br>
decay curve fitting procedure, the effects of oxygen quenching can be <br>
minimized, such that the measurement error due to oxygen quenching is <br>
within the measurement precision for both phosphors.</p>}},
author = {{Nilsson, Sebastian and Feuk, Henrik and Richter, Mattias}},
issn = {{0022-2313}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Journal of Luminescence}},
title = {{High temperature thermographic phosphors YAG:Tm;Li and YAG:Dy in reduced oxygen environments}},
url = {{http://dx.doi.org/10.1016/j.jlumin.2022.119645}},
doi = {{10.1016/j.jlumin.2022.119645}},
volume = {{256}},
year = {{2023}},
}