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

Ojo, Anthony O. and Fond, Benoit and Abram, Christopher and Van Wachem, Berend G. M. and Heyes, Andrew L. and Beyrau, Frank (2017) Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu2+ phosphor particles for thermometry. Optics Express, 25 (10). pp. 11833-11843. ISSN 1094-4087 (https://doi.org/10.1364/OE.25.011833)

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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.

  • Item type:Article
    ID code:61043
    Dates:
    Date
    Event
    15 May 2017
    Published
    11 May 2017
    Published Online
    23 March 2017
    Accepted
    Notes:© 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.
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:22 Jun 2017 11:45
    Last modified:17 Apr 2024 00:27
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/61043
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