Abstract
The temperature profile of a laboratory methane/coal burner is measured by taking the ratio of absorptions for a pair of CO vibration rotation lines with a tunable diode laser system. Assuming an axisymmetric temperature profile, a scan of the cross section of the burner provides an absorption profile which can be inverted into a radial temperature profile by Abel transformation. By selecting the vibrational levels of the CO absorption lines, different optical depths can be achieved in probing the flame. The feasibility of temperature profile measurement is demonstrated by measuring the temperature of a methane/coal burner using a second derivative system on the P0(32) and P2(21) CO absorption lines.
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