Development of temperature imaging using two-line atomic fluorescence

Paul R. Medwell, Qing N. Chan, Peter A.M. Kalt, Zeyad T. Alwahabi, Bassam B. Dally, Graham J. Nathan

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

This work aims to advance understanding of the coupling between temperature and soot. The ability to image temperature using the two-line atomic fluorescence (TLAF) technique is demonstrated. Previous TLAF theory is extended from linear excitation into the nonlinear fluence regime. Nonlinear regime two-line atomic fluorescence (NTLAF) provides superior signal and reduces single-shot uncertainty from 250 K for conventional TLAF down to 100 K. NTLAF is shown to resolve the temperature profile across the stoichiometric envelope for hydrogen, ethylene, and natural gas flames, with deviation from thermocouple measurements not exceeding 100 K, and typically ≲30 K. Measurements in flames containing soot demonstrate good capacity of NTLAF to exclude interferences that hamper most two-dimensional thermometry techniques. © 2009 Optical Society of America.
Original languageEnglish (US)
Pages (from-to)1237-1248
Number of pages12
JournalApplied Optics
Volume48
Issue number6
DOIs
StatePublished - Feb 20 2009
Externally publishedYes

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