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

Burns, I.S. and Hult, J. and Hartung, G. and Kaminski, C.F. (2007) A thermometry technique based on atomic lineshapes using diode laser LIF in flames. Proceedings of the Combustion Institute, 31 (1). pp. 775-782. ISSN 1540-7489

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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 5(2)P(1/2) -> 6(2)S(1/2) 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 withcomparisons to measurements by CARS and by Na-line reversal, and to numerical simulations.