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Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu2+ phosphor particles for thermometry
File(s)
oe-25-10-11833.pdf (2.07 MB)
Published version
OA Location
Author(s)
Ojo, A
Fond, B
Abram, C
Van Wachem, B
Heyes, A
Type
Journal Article
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.
Date Issued
2017-05-11
Date Acceptance
2017-03-23
Citation
Optics Express, 2017, 25 (10), pp.11833-11843
URI
DOI
ISSN
1094-4087
Publisher
Optical Society of America
Start Page
11833
End Page
11843
Journal / Book Title
Optics Express
Volume
25
Issue
10
Copyright Statement
© 2017 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Subjects
Science & Technology
Physical Sciences
Optics
TEMPERATURE-MEASUREMENTS
SINGLE DROPLETS
VELOCITY
TRACER
0205 Optical Physics
1005 Communications Technologies
0906 Electrical And Electronic Engineering
Publication Status
Published