Abstract

Spectral emissivities have been obtained for the 2ν₂+ν₃ and ν₃+ν₁ carbon dioxide combination bands between 3100 and 3800 cm⁻¹ at 1200°, 1500°, and 1800°K. Heated CO₂ was produced in a 150-lb-thrust rocket burner burning gaseous carbon monoxide and oxygen. Emission measurements were made on the expanded exhaust gas of the burner where the composition, total pressure, and temperature could be defined. The spectral emissivities were determined from a calibrated emission spectrum and a spectroscopic determination of the temperature of the test gas. The hot CO₂ samples were observed at a total pressure of 1 atm in the optically thin region where the highest spectral emissivities at 3700 cm⁻¹ were about 0.1. The spectral emissivity curves were used to obtain the integrated intensity of the 2.7-μ CO₂ band at the high temperatures. The variations of the spectral emissivities and integrated intensities with temperature agree with previous predictions.

© 1964 Optical Society of America

High-Temperature Spectral Emissivities of H₂O–CO₂ Mixtures in the 2.7-μ Region

C. C. Ferriso and C. B. Ludwig
Appl. Opt. 3(12) 1435-1443 (1964)

Spectral-Emissivity Measurements of the 4.3-μ CO₂ Band between 2650° and 3000°K*

C. C. Ferriso, C. B. Ludwig, and L. Acton
J. Opt. Soc. Am. 56(2) 171-173 (1966)

High-Temperature Spectral Emissivities and Total Intensities of the 15-μ Band System of CO₂*

C. B. Ludwig, C. C. Ferriso, and L. Acton
J. Opt. Soc. Am. 56(12) 1685-1692 (1966)

Emissivity of Carbon Dioxide at 4.3 μ

William O. Davies
J. Opt. Soc. Am. 54(4) 467-471 (1964)

Infrared Emissivity of Carbon Dioxide (2.7-μ Band)*

W. Malkmus
J. Opt. Soc. Am. 54(6) 751-758 (1964)