Long-path high-resolution atmospheric transmission measurements - Comparison with LOWTRAN 3B predictions

Physics – Optics

Scientific paper

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Atmospheric Moisture, Atmospheric Windows, Computer Programs, High Resolution, Infrared Windows, Light Transmission, Curve Fitting, Fourier Transformation, Graphs (Charts), Transmittance

Scientific paper

A comparison is conducted of absolute-transmission field measurements with predictions provided by studies utilizing the computer code LOWTRAN. High-resolution spectra were obtained with a Fourier transform interferometer-spectrometer (FTS) system during 1977 field measurements made in Florida. Related extinction measurements, made with both DF and CO lasers, were used to obtain absolute transmission normalizations of the high-resolution spectra. To make suitable comparisons of the high-resolution FTS spectra with the LOWTRAN predictions, each spectrum was convolved with a triangular slit whose width at half height was 20 per cm. The results of the comparison are shown in a graph for three water vapor pressures which represent the median and extremes of the H2O concentrations encountered during the measurements made under high visibility conditions.

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