Atmospheric transmission in the 2.8-5.5-µm region: description of the Fourier interferometric transmissometer and typical result at low temperatures
Abstract
A study of moderate resolution (1/cm) atmospheric transmission measurements made over a 5.7-km path and under a wide range of temperatures and humidities is presented. A description of the Fourier interferometric transmissometer used for this study and a detailed analysis of the experimental protocol developed for that type of instrument are given. Results for the 2.8-5.5 micron spectral window are compared to calculations using the LOWTRAN6 and FASCOD2 transmission codes. The accuracy with which these codes predict transmittance in spectral domains (1800-2000 and 3200-3500/cm) strongly affected by water vapor concentration is examined. Preliminary analysis, indicates that although LOWTRAN6 predicts well the summer transmittance (+30.3 C) there are significant divergences for the winter case (-21.4 C). The comparison of FASCOD2 with experimental results shows much closer agreement than LOWTRAN6 for both summer and winter cases.
- Publication:
-
Applied Optics
- Pub Date:
- September 1990
- DOI:
- 10.1364/AO.29.003654
- Bibcode:
- 1990ApOpt..29.3654T
- Keywords:
-
- Atmospheric Optics;
- Fourier Transformation;
- Infrared Absorption;
- Interferometry;
- Transmissometers;
- Atmospheric Models;
- Atmospheric Moisture;
- Atmospheric Temperature;
- Low Temperature;
- Remote Sensing;
- Instrumentation and Photography;
- ATMOSPHERIC OPTICS;
- SPECTROSCOPY: FOURIER;
- TRANSMISSION;
- ATMOSPHERES;
- SPECTROSCOPY: HIGH-RESOLUTION