The effect of thermal and concentration boundary layers on experimental data must be well understood for a successful diagnostic measurement of quasi-uniform high-temperature gases using line-of-sight absorption spectroscopy. In this paper, an energy–temperature curve is proposed to assist in selection of candidate absorption lines. Two techniques, the effective absorption path length method and the direct curve–fit method, are proposed to extract absolute concentrations from absorption data obtained in the presence of boundary layers.
© 1989 Optical Society of America
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