Abstract
Thermometry of an oxy-acetylene flame using multiplex Degenerate Four-Wave Mixing (DFWM) of C2 is demonstrated. More than 100 rotational transitions in thed 3 Π g ←a 3 Π u (0,0) Swan band of C2 could be recorded simultaneously by use of a pulsed, broad bandwidth “modeless” laser. Temperatures were inferred by fitting temperature-dependent synthetic spectra of single- or multiple-shot averaged spectra. The strength and reliability of recorded signals together with the large number of rotational lines observed suggest that multiplex DFWM is a promising technique for minor species detection and for temporally resolved temperature measurements in luminous environments. Factors influencing the accuracy and precision of single-shot thermometry using the technique are discussed.
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Kaminski, C.F., Hughes, I.G., Lloyd, G.M. et al. Thermometry of an oxy-acetylene flame using multiplex degenerate four-wave mixing of C2 . Appl. Phys. B 62, 39–44 (1996). https://doi.org/10.1007/BF01081245
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DOI: https://doi.org/10.1007/BF01081245