Abstract
Measurements of gas temperatures and concentrations in combustion and industrial processes, where hot gases are produced, can be carried out using low resolution Fourier transform IR emission spectroscopy. An experimental setup is presented for measuring transmittance as well as emittance spectra of hot gases enclosed in a heated gas cell. It is shown that the measured emissivity of a CO<SUB>2</SUB> and CO mixture at 673 compare well with the absorptivity measured of the gas sample. The influence of the spectral resolution on the detection limit of CO in our experimental setup at 673 K is discussed and illustrated with experimental results and calculations. It is concluded that the most precise CO concentration measurement is obtained at low spectral resolution from a single point in the spectrum. The gas temperature and water vapor content in the hot gas of a power plant boiler can be extracted from low resolution emission spectra which is illustrated with experiments carried out on a power plant.
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