Long Path Atmospheric Transmittance Measurements: Technique, Instrumentation And Results

The equipment and data analysis used by a field laboratory system to measure atmospheric transmittance spectra are described. Measurements have been made at distances up to 44 Km in the 3-5μm region and up to 24 Km in the 8-12 μm region. The results agree well with the latest version of the LOWTRAN computer code.