The propagation of terahertz (THz) band radiation through the atmosphere is a topic of increasing interest as advanced passive and active imaging systems are developed that operate in this spectral region. Much of the impact of the boundary layer atmosphere in this band is due to water vapor absorption, which is very strong even in atmospheric window regions. Most of the effect of atmospheric water vapor is due to the ...
An array of 10 sonic anemometers was used to observe the mean wind and turbulence near an artificial wind barrier at the High Speed Test Track facility on Holloman Air Force Base, NM. In order to test the effectiveness of such barriers in reducing cross-track winds, a prototype barrier was constructed using a polyester screen material rated as providing 30% porosity. The barrier dimensions were 100 m in length and ...
In this Field Study Overview, we (1) describe the foundational scientific and engineering aspects of the airflow and stability field study and (2) provide an administrative report on the field study execution with its associated research application drills The six mission objectives driving this project were derived from three general areas: urban atmosphere research, technology advancements and research applications The preliminary results section summarizes the objective successes. The technical report ...
The NATO Research Technology Group 40 (RTG-40) was established in 2003 to develop improved models of active imaging system performance to include the effects of atmospheric optical turbulence. Supporting the development of these models is the performance of naval and land field trials to provide data bases of system performance under varying turbulence conditions. In support of the land trials, the U.S. Army Research Laboratory s (ARL) Computational and Informational ...
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