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A Technique for Extrapolating Absorption Coefficient Measurements to High Temperatures



Stephen P. Fuss, K Wakatsuki, Anthony P. Hamins, Marc R. Nyden


This study outlines the development of a technique that extends the range of molecular absorption coefficients to temperatures beyond those for which measurements are available. The technique utilizes a simplified expression for spectral absorption coefficient that is reduced to three fitting parameters and two independent variables. The technique was validated using CO, CO2, and water vapor as test cases with data from the HITEMP molecular database. Results indicate that the difference between actual and predicted integrated absorption coefficients are less than 10 % at 1000 K when fits are performed at temperatures up to 700 K. New infrared absorption measurements for propane are presented for the temperature range 296 K to 602 K and the data are extrapolated to 1000 K.
Joint Meeting of the Combustion Institute


absorbance, absorption coefficient, FTIR, high temperature, HITEMP, propane


Fuss, S. , Wakatsuki, K. , Hamins, A. and Nyden, M. (2004), A Technique for Extrapolating Absorption Coefficient Measurements to High Temperatures, Joint Meeting of the Combustion Institute, [online], (Accessed April 19, 2024)
Created July 30, 2004, Updated February 17, 2017