The Electro-Optical Systems Atmospheric Effects Library (EOSAEL) was developed in 1979 by the U.S. Army

Atmospheric Sciences Atmospheric science is the study of the Earth's atmosphere and its various inner-working physical processes. Meteorology includes atmospheric chemistry and atmospheric physics with a major focus on weather forecasting. Climatology is the study of ...

Laboratory, which later became a part of the U.S. Army Research Laboratory. EOSAEL was a library of theoretical, semi-empirical, and empirical computer models that described various aspects of

atmospheric An atmosphere () is a layer of gas or layers of gases that envelop a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A s ...

effects in battlefield environments. As of 1999, EOSAEL consisted of 22 models.

Background

EOSAEL was focused on weather effects and how weather impacts military technology. The battlefield environment includes many sources of

aerosol An aerosol is a suspension (chemistry), suspension of fine solid particles or liquid Drop (liquid), droplets in air or another gas. Aerosols can be natural or Human impact on the environment, anthropogenic. Examples of natural aerosols are fog o ...

s and particulates, including chemical/

biological agents A biological agent (also called bio-agent, biological threat agent, biological warfare agent, biological weapon, or bioweapon) is a bacterium, virus, protozoan, parasite, fungus, or toxin that can be used purposefully as a weapon in bioterrorism ...

, smoke, dust, and

chaff Chaff (; ) is the dry, scaly protective casing of the seeds of cereal grains or similar fine, dry, scaly plant material (such as scaly parts of flowers or finely chopped straw). Chaff is indigestible by humans, but livestock can eat it. In agri ...

. Weather in these environments impacts the functions of military technology, specifically electro-optical devices used for target acquisition. A need for standard tools to facilitate system performance analyses and weather impact decision aids led to development of standard algorithms for modeling efforts, which became a part of EOSAEL.

Description

The EOSAEL modules provide transmittance and radiance calculations through gases, natural aerosols, battlefield aerosols, smoke, haze, fog, and clouds for

bandpass A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. Description In electronics and signal processing, a filter is usually a two-port ...

and laser propagation. Its operating system is

Microsoft Windows 3.1 Windows 3.1 is a major release of Microsoft Windows. It was released to manufacturing on April 6, 1992, as a successor to Windows 3.0. Like its predecessors, the Windows 3.1 series ran as a shell on top of MS-DOS. Codenamed Janus, Windows 3. ...

, a graphical display operating system which gives a common interface to hardware. EOSAEL models provide the visible and near-infrared (0.2-2.0 ]dm),

mid-infrared Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around ...

(3.0-5.0 urn), far-infrared (8.0-12.0 ym), and millimeter wave (10–350 GHz) regions of the spectrum, plus 53 laser lines.

References

{{Reflist Governmental meteorological agencies in North America Research installations of the United States Army Military technology Military simulation