Abstract
A method for estimating the temperature of a sample of CO 2 gas heated above ambient temperature is evaluated. A nonlinear, least-squares regression fir for the peak absorbance of the rotation-vibration lines of the hot bands of CO 2 was obtained for samples at temperatures from 90 to 190°C and at pressures from 200 to 650 torr. The i.r. spectra of CO 2 gas samples in a 1 m cell were collected using a Fourier-transform i.r. spectrometer. The spectral resolution was sufficient to resolve the rotational fine structure of these bands. However, it was necessary to account for the effect of limited instrument resolution in fitting the data. The temperatures retrieved from the regression were compared with the temperature of the sample. Good agreement was obtained between the directly measured temperature and the value determined spectroscopically. The sensitivity of the fitting program to increased noise in the spectrum was also studied.
Published Version
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