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Proceedings Paper

Temperature Dependence Of Atmospheric Transmittance In The 2.8-5.5 Gm Region
Author(s): J. M. Theriault; P. L. Roney; F. Reid; A. Kohnle
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Paper 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.

Paper Details

Date Published: 11 October 1989
PDF: 13 pages
Proc. SPIE 1115, Propagation Engineering, (11 October 1989); doi: 10.1117/12.960882
Show Author Affiliations
J. M. Theriault, DREV-Defence Research Establishment Valcartier (Canada)
P. L. Roney, DREV-Defence Research Establishment Valcartier (Canada)
F. Reid, DREV-Defence Research Establishment Valcartier (Canada)
A. Kohnle, Forschungsinstitut fur Optik (Federal Republic of Germany)

Published in SPIE Proceedings Vol. 1115:
Propagation Engineering
Norman S. Kopeika; Walter B. Miller, Editor(s)

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