Abbreviations/Acronyms: A

absolute (kelvin degrees), absorption, acoustic, alpha particle, analog, anode, ampere, amplitude, area, atomic, atomic mass, Helmholtz free energy, mass number, nucleon number

analog-to-digital

analog to analog, anti-aliasing (AA optical filter e.g. low pass filter), approximate absolute temperature, atomic absorption

Analog Adaptive Resonance Theory

The ABg model or Harvey-Shack is a method of describing bidirectional scattering from isotropic or polished surfaces.

alternating current

analog-to-digital converter; allyl diglycol carbonate

adaptive differential pulse code modulation; varies the binary step interval for the required bandwidth for a given signal-to-noise ratio.

aeronautics

axial gradient index

American Institute of Aeronautics and Astronautics

adaptive learning image analysis system

American National Metric Council

Association Nationale de la Recherche Technique

American National Standards Institute

acousto-optic tunable filter

Abbe refractometer; acoustic radiometer; acoustic resonance; active region; alpha ray; amplitude ratio; antireflective; aperture ratio; applied research; argon; aspect ratio; atomic reactor; augmented reality

antiresonant reflecting optical waveguide

automatic spectrum display and signal recognition system

automatic system for kinematic analysis

advanced tactical air reconnaissance system

automatic tracking laser illumination system

additive white Gaussian noise