Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu2+ phosphor particles for thermometry

Anthony O. Ojo, Benoit Fond, Christopher Abram, Berend G. M. Van Wachem, Andrew L. Heyes, Frank Beyrau

Research output: Contribution to journalArticle

6 Citations (Scopus)
15 Downloads (Pure)

Abstract

Simultaneous point measurements of gas velocity and temperature were recently demonstrated using thermographic phosphors as tracer particles. There, continuous wave (CW) excitation was used and the spectral shift of the luminescence was detected with a two-colour intensity ratio method to determine the gas temperature. The conventional laser Doppler velocimetry (LDV) technique was employed for velocimetry. In this paper, an alternative approach to the gas temperature measurements is presented, which is instead based on the temperature-dependence of the luminescence lifetime. The phase-shift between the luminescence signal and time-modulated excitation light is evaluated for single BaMgAl10O17:Eu2+ phosphor particles as they cross the probe volume. Luminescence lifetimes evaluated in the time domain and frequency domain indicate that in these experiments, interferences from in-phase signals such as stray excitation laser light are negligible. The dependence of the phase-shift on flow temperature is characterised. In the temperature sensitive range above 700 K, precise gas temperature measurements can be obtained (8.6 K at 840 K) with this approach.
Original languageEnglish
Pages (from-to)11833-11843
Number of pages11
JournalOptics Express
Volume25
Issue number10
Early online date11 May 2017
DOIs
Publication statusPublished - 15 May 2017

Fingerprint

Velocity measurement
Phosphors
phosphors
temperature measurement
Luminescence
gas temperature
luminescence
Lasers
Gas fuel measurement
lasers
phase shift
Phase shift
Temperature measurement
life (durability)
Temperature
wave excitation
Laser excitation
excitation
continuous radiation
tracers

Keywords

  • temperature
  • flow diagnostics
  • laser Doppler velocimetry
  • remote sensing and sensors
  • spectroscopy
  • fluorescence
  • luminescence
  • combustion diagnostics

Cite this

Ojo, Anthony O. ; Fond, Benoit ; Abram, Christopher ; Van Wachem, Berend G. M. ; Heyes, Andrew L. ; Beyrau, Frank. / Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu2+ phosphor particles for thermometry. In: Optics Express. 2017 ; Vol. 25, No. 10. pp. 11833-11843.
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Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu2+ phosphor particles for thermometry. / Ojo, Anthony O.; Fond, Benoit ; Abram, Christopher ; Van Wachem, Berend G. M.; Heyes, Andrew L.; Beyrau, Frank.

In: Optics Express, Vol. 25, No. 10, 15.05.2017, p. 11833-11843.

Research output: Contribution to journalArticle

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AU - Heyes, Andrew L.

AU - Beyrau, Frank

N1 - © 2017 Optical Society of America.]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

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N2 - Simultaneous point measurements of gas velocity and temperature were recently demonstrated using thermographic phosphors as tracer particles. There, continuous wave (CW) excitation was used and the spectral shift of the luminescence was detected with a two-colour intensity ratio method to determine the gas temperature. The conventional laser Doppler velocimetry (LDV) technique was employed for velocimetry. In this paper, an alternative approach to the gas temperature measurements is presented, which is instead based on the temperature-dependence of the luminescence lifetime. The phase-shift between the luminescence signal and time-modulated excitation light is evaluated for single BaMgAl10O17:Eu2+ phosphor particles as they cross the probe volume. Luminescence lifetimes evaluated in the time domain and frequency domain indicate that in these experiments, interferences from in-phase signals such as stray excitation laser light are negligible. The dependence of the phase-shift on flow temperature is characterised. In the temperature sensitive range above 700 K, precise gas temperature measurements can be obtained (8.6 K at 840 K) with this approach.

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