Tomographic analysis of CO absorption in a low-pressure flame

• Published in: Applied optics (2004) Vol. 34; no. 18; p. 3318
• Main Authors: McNesby, K L, Daniel, R G, Morris, J B, Miziolek, A W
• Format: Journal Article
• Language: English
• Published: United States 20.06.1995
• ISSN: 1559-128X
• DOI: 10.1364/AO.34.003318

Tomographic analysis is used to provide a correction to low-pressure stoichiometric premixed CH(4)/O(2) flame temperatures measured with tunable diode laser absorption spectroscopy employing CO two-line thermometry. It is shown that flame temperatures measured with line-of-sight-based two-line thermometry are always too low and that the correction to the observed temperature is a nonlinear function of the height above the burner surface. It is also shown that, at a given height in the flame, a constant temperature across the flame does not imply that vibrational populations are constant and that, at low pressures (<20 Torr), the flame spreads radially beyond the burner diameter and so may no longer be approximated by a one-dimensional model.