f number (f/#)f-Theta lensf/#: f number
m: electron rest mass
n: refractive index
µ: micro- the SI metric unit prefix, which represents one millionth, i.e. 10-6, of a given unit
µm: micron (also referred to as the micrometer)- which represents one millionth, i.e. 10-6 of the SI unit for length that is the meter.
2D profile sensor3-D: three-dimensional
3D laser line profile sensor3D laser triangulation3D printingA: absolute (kelvin degrees), absorption, acoustic, alpha particle, analog, anode, ampere, amplitude, area, atomic, atomic mass, Helmholtz free energy, mass number, nucleon number
a: atto-
Å: angstrom
A-O: acousto-optic
A/D: analog-to-digital
aA: attoampere
AA: analog to analog, anti-aliasing (AA optical filter e.g. low pass filter), approximate absolute temperature, atomic absorption
AAAS: American Association for the Advancement of Science
AART: Analog Adaptive Resonance Theory
AAS: American Astronomical Society
Abaxial rayabaxial spherical aberration (see: oblique spherical aberration)Abbe condenserAbbe constantAbbe illuminationAbbe prismAbbe refractometerAbbe sine condition (see: sine condition)Abbe-Porro prismaberrationaberration sensor (wavefront sensor)ABG: The ABg model or Harvey-Shack is a method of describing bidirectional scattering from isotropic or polished surfaces.
ablation (see: laser ablation)ablation thresholdablative photodecompositionablative wall flashlampAbney effectabrasion markabrasiveabridged spectrophotometerABS: absorbance; acrylonitrile butadiene styrene
abs: absolute value
absolute colorimetricabsolute luminance thresholdabsolute magnificationabsolute purity thresholdabsolute refractive indexabsolute temperature scale