Abstract
We are presently conducting experiments in which we obtain both temperature and species concentration profiles of a low pressure, premixed methane/oxygen flame, to which small amounts (0.25 -1.0 %) of a halogenated methane compound have been added. We are using the method of Two Line Thermometry [1], in which a pair of IR active transitions are recorded by tunable diode laser (TDL) absorption spectroscopy and analyzed to determine the temperature of the flame and the partial pressure of the absorbing species. This method offers a nonperturbing probe of flame characteristics and has the abilitiy to operate over a broad range of elevated temperatures. TDL absorption spectroscopy can be used wherever a line-of-sight configuration is possible and background gas absorptions do not interfere.
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