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11 October 1989 Temperature Dependence Of Atmospheric Transmittance In The 2.8-5.5 μm Region
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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.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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