Abstract
A method for estimating the temperature of a gas sample is described, based on emission measurements of the laser bands of CO 2 near 10-μm. A method of nonlinear least-squares regression, which had previously been demonstrated for absorption spectra of CO 2, is shown to be applicable to laboratory emission spectra of pure CO 2, measured on a Fourier transform infrared spectrometer. The method is based on modelling the intensities of the rovibrational lines of the band, which are measured at moderate (0.1-0.5 cm -1) resolution. Among the physical and instrumental factors considered are the classical intensity pattern of the lines, the blackbody radiation distribution, the instrument response function, and the instrument line-shape function. The results indicated a positive bias of about 20°C in the estimated temperature, due primarily to the noise in the spectra.
Published Version
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