ISSN Online: 2377-424X
International Heat Transfer Conference 5
A BAND SPREAD METHOD FOR REMOTE SENSING OF HOT GAS TEMPERATURES
Abstract
A spectroscopic method is proposed for remote sensing the temperature of a hot gas from its
emission spectrum. It is based on the inherent spreading feature of the peak of a P or R branch which
shifts away from its band center as temperature increases. Such a band spread method is better than
the conventional spectroscopic techniques in that no prior knowledge of the emissivity, concentration or
physical path length of the remote gas is necessary. It is shown that the existing spectral absorptivity
or transmissivity data at elevated temperature can be used to correlate the peak positions of an emission
spectrum as a function of the temperature. Useful correlations needed for the method have been obtained
for six gases: CO, NO, S02, C02, H2O and CH4.