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Proceedings Paper

Determination of the temperature fields in exhaust gases by infrared spectroscopy
Author(s): Olivier Jacquot; Philippe J.L. Herve
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Paper Abstract

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.

Paper Details

Date Published: 15 December 1998
PDF: 8 pages
Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332667
Show Author Affiliations
Olivier Jacquot, Univ. de Paris X (France)
Philippe J.L. Herve, Univ. de Paris X (Netherlands)

Published in SPIE Proceedings Vol. 3493:
Spectroscopic Atmospheric Environmental Monitoring Techniques
Klaus Schaefer, Editor(s)

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