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Proceedings Paper

Wide-spectral-range transmissometer used for fog measurements
Author(s): Vernon Turner; Christian A. Trowbridge
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Paper 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.

Paper Details

Date Published: 1 July 1991
PDF: 10 pages
Proc. SPIE 1487, Propagation Engineering: Fourth in a Series, (1 July 1991); doi: 10.1117/12.46567
Show Author Affiliations
Vernon Turner, Phillips Lab. (United States)
Christian A. Trowbridge, Photometrics, Inc. (United States)

Published in SPIE Proceedings Vol. 1487:
Propagation Engineering: Fourth in a Series
Luc R. Bissonnette; Walter B. Miller, Editor(s)

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