Temperature and water mole fraction measurements by time-domain-based supercontinuum absorption spectroscopy in a flame

AbstractIn this manuscript, we present the first quantitative multi-scalar measurements by time-domain-based supercontinuum absorption spectroscopy in a flame. Temperature and $$\hbox {H}_{2}\hbox {O}$$H2O mole fraction are determined simultaneously from broadband $$\hbox {H}_{2}\hbox {O}$$H2O spectra ranging from 1,340 to 1,485 nm by a multi-peak least square fit between experiments and simulated spectra. To this end, a combination of the most comprehensive databases, namely the Barber–Tennyson database (BT2) and HITRAN2012, is used. Line strength values listed in BT2 are combined with averaged broadening coefficients and temperature exponents based on the upper rotational quantum number J from the latest HITRAN database to precisely model the line shape function for each transition. The height-dependent temperature and $$\hbox {H}_{2}\hbox {O}$$H2O mole fraction profiles of a premixed one-dimensional flame of a McKenna type burner are reconstructed by direct comparison of experimental spectra with theory. For verification, the temperature data obtained are compared with a profile determined by coherent anti-Stokes Raman scattering.

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