Accession Number : ADA293810

Title :   Validation of the Atmospheric Transmission Large-Area Analysis System (ATLAS).

Descriptive Note : Final rept.,

Corporate Author : ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM

Personal Author(s) : Bleiweiss, Max P.

PDF Url : ADA293810

Report Date : FEB 1995

Pagination or Media Count : 44

Abstract : The Atmospheric Transmission Large-Area Analysis System (ATLAS) is a unique tool that has been under development at the U.S. Army Research Laboratory since the mid-1980's. ATLAS is a nonintrusive, passive technique capable of producing two-dimensional transmittance maps of a smoke cloud in a plane perpendicular to the main-optical-axis line of sight (LOS). (Off-axis LOSs are not perpendicular but are in a fan with an angular intersect determined by the overall field of view of the imager.) (The accuracy and precision of the transmission values depends on the test conditions during which the measurements are made but can be defined through the error analyses discussed in this report. The spatial resolution of the resulting transmission maps is is also test specific, but, typically, is of the order of a few tens of centimeters. The temporal resolution is determined by the video rates of the imaging system, which, after preliminary low-pass filtering, yields maps at 10 Hz.) ATLAS is at the stage of development that it is used on a regular basis to support smoke/obscurant field tests. For this reason, a validation process was defined and implemented in 1989. This report documents the completion of that effort as a major milestone for the laboratory during FY92. In addition, the capabilities and limitations of the ATLAS technique are discussed in detail. jg

Descriptors :   *VALIDATION, *SMOKE, *ATMOSPHERE MODELS, LINE OF SIGHT, SPATIAL DISTRIBUTION, CLOUDS, OPTICS, SCATTERING, ENVIRONMENTS, ARMY RESEARCH, TWO DIMENSIONAL, RESOLUTION, PASSIVE SYSTEMS, TRANSMITTANCE, ERROR ANALYSIS, RADIANCE, IMAGES, MAPS, DATA RATE, VIDEO SIGNALS, LOW PASS FILTERS, ELECTROMAGNETIC SPECTRA, OBSCURATION.

Subject Categories : Atmospheric Physics
      Meteorology
      Countermeasures
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE