Wide-spectral-range transmissometer used for fog measurements

Vernon Turner; Christian A. Trowbridge

doi:10.1117/12.46567

1 July 1991 Wide-spectral-range transmissometer used for fog measurements

Vernon Turner, Christian A. Trowbridge

Proceedings Volume 1487, Propagation Engineering: Fourth in a Series; (1991) https://doi.org/10.1117/12.46567
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

A wide spectral range transmissometer has been developed at the Phillips Laboratory for long path atmospheric measurements. It was designed to provide narrow band spectral coverage in three bands between 0.4 and 14 micrometers by programmed scanning with circular variable filters. The system uses three detectors so that three spectral regions can be sampled simultaneously. Two sources, a black body and a ribbon filament lamp, are combined in a single beam. A two-way path is provided by use of cats-eye retro-reflectors. Transmitter and receiver are combined in the same unit and, by using multiple retro-reflectors located at different positions, the path length can be readily changed by realignment of the unit. This increases the dynamic range of the system and makes possible measurement of rapidly changing atmospheric conditions. The transmissometer was recently used to provide transmission measurements as part of the FLAPIR (forward-looking infrared and lidar atmospheric propagation in the infrared) field measurement program at Brunswick Naval Air Station, which had the purpose of determining the feasibility of using lidars to predict the effectiveness of infrared imaging devices. Measurements were made primarily in fog and rain conditions.

Citation Download Citation

Vernon Turner and Christian A. Trowbridge "Wide-spectral-range transmissometer used for fog measurements", Proc. SPIE 1487, Propagation Engineering: Fourth in a Series, (1 July 1991); https://doi.org/10.1117/12.46567

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