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Accurate Formula for Gaseous Transmittance in the Infrared

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Abstract

By considering the infrared transmittance model of Zachor as the equation for an elliptic cone, a quadratic generalization is proposed that yields significantly greater computational accuracy. The strong-band parameters are obtained by iterative nonlinear, curve-fitting methods using a digital computer. The remaining parameters are determined with a linear least-squares technique and a weighting function that yields better results than the one adopted by Zachor. The model is applied to CO2 over intervals of 50 cm−1 between 550 cm−1 and 9150 cm−1 and to water vapor over similar intervals between 1050 cm−1 and 9950 cm−1, with mean rms deviations from the original data being 2.30 × 10−3 and 1.83 × 10−3, respectively.

© 1971 Optical Society of America

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