Source brightness fluctuation correction in Fourier-transform hyperspectral imaging of flames

摘要

Infrared emission spectra provide very useful information for the study and optimization of combustion processes. However, their characteristic brightness fluctuations (flicker) are a problem for Fourier transform spectrometers, because they introduce artifacts into the measured spectra. In this work, a method for the correction of these effects is presented which requires the acquisition of interferograms, measured in continuous (DC) mode, for both the hot combustion source and a cold reference. The method is applied to measurements in the mid-infrared of the flame of a Bunsen burner, to eliminate artifacts due to flicker, making possible quantitative studies of temperature and chemical composition.