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15 December 1998 Evaluation procedure for nonintrusive exhaust gas analysis of jet engines using FTIR spectroscopy
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A method for the non-intrusive determination of temperature and concentrations of the exhaust gases of aeroengines will be presented. A MIROR-type FTIR spectrometer is used to measure spectra of the IR radiation emitted by the hot gases in the exhaust. New evaluation software, specially developed for this application, is described. The software permits line-by-line radiative transfer modeling of the radiance emitted by the exhaust of these engines. Least squares fitting routines are then used to match the measured with the modeled spectrum, thereby determining the unknown quantities, i.e., temperature and species concentrations. Results of measurements aboard aircraft are presented. The achieved accuracy in temperature is estimated to be better than 1 percent. Comparison of the values determined for the NOx emission index with results from correlation models show deviations of 15 to 20 percent and are thus within the accuracy limits claimed for both methods.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Erwin Lindermeir, Peter Haschberger, and Rachel M. Geatches "Evaluation procedure for nonintrusive exhaust gas analysis of jet engines using FTIR spectroscopy", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998);

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