Medium resolution transmission measurements of CO2 at high temperature-an update

The current work presents updated measurements of narrow-band transmission for the 2.0, 2.7 and 4.3μm bands of CO2 at temperatures of up to 1550 K. In addition, measurements for the 15μm band of CO2 are also presented for the first time. Data were collected with an improved drop tube design (as compared to the earlier measurements) and an FTIR-spectrometer. The measured data were compared with the CDSD and HITEMP databases, as well as with previous data obtained from the old drop tube apparatus. The new data have less uncertainties at extreme temperatures than the old data and eliminate some of the problems associated with subtraction of the emission signal with the old apparatus. The data show minor discrepancies with the high-resolution databases, particularly with HITEMP at higher temperatures, but in general agreement is good.