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15 December 1998 Determination of the temperature fields in exhaust gases by infrared spectroscopy
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Passive emission spectroscopy using a line by line model carbon dioxide around band head region has been developed to determine the temperature and concentration fields of exhaust gases. Resulting is a model which takes into account the hot band parameter in the first CO2 band head in the 2397 cm-1 region. Modeling absorption spectra have been compared with measurement absorption spectra in a new tight high temperature gas cell. Error is less than 2 percent until 1 100 K. The solution of the radiative transfer equation, is found by least square fitting between measured spectra and line by line modeling spectra inversion software, uses a non-linear simplex algorithm and a procedure of random couple pulling of temperature and partial pressure for testing convergence. It allows a discretization in four elements of the gas flow. Measurements were performed with a FTIR spectrometer using a telescope form gas exhaust form a 100 KW engine through an ambient air of 7 meters path. The average value is in good agreement with the measure of a thermocouple, in the center of the flow positioned. Thermocouple maximum deviation is 23 K between the measures and the worst element calculation.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Olivier Jacquot and Philippe J.L. Herve "Determination of the temperature fields in exhaust gases by infrared spectroscopy", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998);

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