Abstract

Absorption coefficient measurements in CO2–He–N2 mixtures have been performed over the 295–650-K temperature range at four wavelengths of the 10.4-μm CO2 laser transition. Calculated values of the absorption coefficient were compared with the measured values for fifteen gas mixtures and agreed to >10%. A gas mixture interpolation scheme allows an accurate estimation of absorption by gas mixtures other than those on which measurements were made. A less accurate but simpler interpolation method, dependent only on the fraction of CO2, is also discussed for determining the absorption coefficient.

© 1980 Optical Society of America

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