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Proceedings Paper

Ground-to-space atmospheric transmittance measurements in the 3- to 5-um and 8- to 12-um spectral regions: comparison with LOWTRAN 7
Author(s): Adam D. Devir; Nahum Brandman; Baruch Barzilai; Ami Ben-Shalom Friedman
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Paper Abstract

The computer code LOWTRAN is widely and extensively used for the prediction of propagation of IR radiation through the atmosphere. The latest version of this code, LOWTRAN 7, is assumed to be the most elaborate and accurate one. Hence it was decided to test its validity by comparing its prediction for ground-to-space slant paths with actual transmittance measurements with the sun as a blackbody source. A good agreement between the theoretical predictions and the experimental results were obtained in the 8 - 12 micrometers spectral region for all zenith angles between 90 degree(s) and 60 degree(s) (0 degree(s) to 30 degree(s) above the horizon). In the 3 - 5 micrometers spectral region some spectral discrepancy was observed though the value of the integrated measured transmittance agreed well with the predicted one. The reasons for this can be assumed to be in the new band model absorption parameters (in the 3 - 4 micrometers region) and in the water continuum model (in the 4.4 - 5.2 micrometers region).

Paper Details

Date Published: 13 August 1993
PDF: 15 pages
Proc. SPIE 1971, 8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing, (13 August 1993); doi: 10.1117/12.151017
Show Author Affiliations
Adam D. Devir, Technion R&D Foundation, Ltd. (Israel)
Nahum Brandman, Technion R&D Foundation, Ltd. (Israel)
Baruch Barzilai, Technion R&D Foundation, Ltd. (Israel)
Ami Ben-Shalom Friedman, Technion R&D Foundation, Ltd. (Israel)

Published in SPIE Proceedings Vol. 1971:
8th Meeting on Optical Engineering in Israel: Optical Engineering and Remote Sensing
Moshe Oron; Itzhak Shladov; Yitzhak Weissman, Editor(s)

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