TEMPERATURE DEPENDENCE OF ATMOSPHERIC TRANSMITTANCE IN THE 2.8-5.5 MU M REGION

Authors
  1. Theriault, J.M.
  2. Roney, P.L.
  3. Reid, F.
  4. Kohnle, A.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN);Forschungsinstitut fuer Optik (FfO) of the FGAN, Tuebingen (West Germany)
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 vapor concentration. Preliminary analysis indicates that, although LOWTRAN 6 predicts well the summer transmittance (+30.3C) there are significant errors for the winter case (-21.4C). 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.
Date of publication
15 Mar 1989
Number of Pages
12
Reprinted from
Proceedings of SPIE, vol 1115, 1989, p 295-304
DSTKIM No
91-03187
CANDIS No
70379
Format(s):
Hardcopy;Originator's fiche received by DSIS

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