QUANTITATIVE-ANALYSIS OF REMOTE GAS TEMPERATURES AND CONCENTRATIONS FROM THEIR INFRARED-EMISSION SPECTRA

Techniques for obtaining quantitative values of the temperatures and c oncentrations of remote hot gaseous effluents from their measured pass ive emission spectra have been examined in laboratory experiments and on field trials. These emission spectra were obtained using an adapted FTIR spectrometer with 0.25 cm(-1) spectral resolution. The CO2 and H 2O vapour content in the plume from a 55 m smoke stack and the tempera ture of these gases were obtained by comparing the measured emission s pectra with those modelled using the HITRAN atmospheric transmission d atabase. The spatial distributions of CO2, CO and unburnt CH4 in a lab oratory methane flame were reconstructed tomographically using a matri x inversion technique.