Thermographic laser Doppler velocimetry

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

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
195 Downloads (Pure)


We propose a point-measurement technique for simultaneous gas temperature and velocity measurement based on thermographic phosphor particles dispersed in the fluid. The flow velocity is determined from the frequency of light scattered by BaMgAl10O17:Eu2+ phosphor particles traversing the fringes like in conventional LDV. Flow temperatures are derived using a two-colour ratio method applied to the phosphorescence from the same particles. This combined diagnostic technique is demonstrated with a temperature precision of 4-10% in a heated air jet during steady operation for flow temperatures up to 624 K. The technique provides correlated vector-scalar data at high spatial and temporal resolution.
Original languageEnglish
Pages (from-to)4759-4762
Number of pages5
JournalOptics Letters
Issue number20
Early online date18 Sept 2015
Publication statusPublished - 13 Oct 2015


  • gas analysis
  • phosphor
  • flow dynamics


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