Temperature Dependence Of Atmospheric Transmittance In The 2.8-5.5 Gm Region

J. M. Theriault; P. L. Roney; F. Reid; A. Kohnle

doi:10.1117/12.960882

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11 October 1989 Temperature Dependence Of Atmospheric Transmittance In The 2.8-5.5 μm Region

J. M. Theriault, P. L. Roney, F. Reid, A. Kohnle

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Proceedings Volume 1115, Propagation Engineering; (1989) https://doi.org/10.1117/12.960882
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

Low and high resolution measurements (20 and 1 cm-1) of atmospheric transmittance between 1800 and 3500 cm-1 over a 5.7 km horizontal path under extreme conditions of temperature are reported. Results are compared to calculations using the LOWTRAN 6 and FASCOD2 transmission codes. In particular, we examine the accuracies with which these codes predict transmittance in spectral domains (1800-2000 and 3200-3500 cm-1) strongly affected by water vapour concentration. Preliminary analysis indicates that, although LOWTRAN 6 predicts well the summer transmittance (+30.3 °C) there are significant errors for the winter case (-21.4 °C). In this case, LOWTRAN 6 underestimates the transmittance by about 20 % in the region near 2000 cm-1 and 3300 cm-1. The comparison of FASCOD2 with experimental results shows a much closer agreement than for LOWTRAN 6 for both summer and winter cases.

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J. M. Theriault, P. L. Roney, F. Reid, and A. Kohnle "Temperature Dependence Of Atmospheric Transmittance In The 2.8-5.5 μm Region", Proc. SPIE 1115, Propagation Engineering, (11 October 1989); https://doi.org/10.1117/12.960882

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