Spectral characteristics of infrared transmittance of the atmosphere in the region 2.8-14 microns - Preliminary measurements

Physics – Optics

Scientific paper

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Atmospheric Optics, Infrared Radiation, Light Transmission, Transmittance, Atmospheric Moisture, Computer Programs, Infrared Spectra, Spectroradiometers, Water Vapor

Scientific paper

Preliminary measurements of the atmospheric transmittance spectrum along horizontal paths up to 44 km in length have been made. The equipment, a collimated radiation source and a moderate-resolution measurement system, is described in some detail, and also the method of processing the results. Some examples of measured spectra are shown and compared with the prediction of the LOWTRAN 4 program. In particular, quantitative discrepancies are indicated in the 2.8-5.5-micron region. Smaller differences were detected in the 8-14-micron region at long distances for which the LOWTRAN program appears to predict consistently small values for the transmittance.

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