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A thermometry technique based on atomic lineshapes using diode laser LIF in flames

Burns, IS; Hult, J; Hartung, G; Kaminski, CF, "A thermometry technique based on atomic lineshapes using diode laser LIF in flames", PROCEEDINGS OF THE COMBUSTION INSTITUTE 31:775-782(2007), doi:10.1016/j.proci.2006.07.243, |pdf 


Abstract

We report on the development of a novel diode laser thermometry technique permitting temperature measurements in flames based on the fluorescence lineshapes of an atomic tracer species. The technique, which we term OLAF (one-line atomic fluorescence) requires only a single diode laser source for excitation, is simple to implement, and has excellent spatial resolution. Temperatures are deduced from the 52P1/2 fi 62S1/2 transition of atomic indium, the lineshape of which is highly sensitive to temperature changes at typical flame conditions. A rigorous validation is performed in a reference flame with comparisons to measurements by CARS and by Na-line reversal, and to numerical simulations.