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8,236 terms
Photonics Dictionary
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vision
The processes in which luminous energy incident on the eye is perceived and evaluated.
vision-transformer networks
Vision transformer (ViT) networks are neural network architectures that apply the Transformer architecture, originally developed for natural language processing, to the task of processing visual...
visual angle
The angle subtended by an object at the point of observation.
visual axis
An imaginary line between the object, through the nodal point of the eye, and the fovea, or point of finest retinal acuity.
visual binaries
A pair of stars (double star) that can be seen separately with a telescope, generally by setting a filar micrometer for the separation and position angle. Observation of visual binaries improves with...
visual detection and ranging
Visual detection and ranging (ViDAR) is a technology that utilizes optical sensors, such as cameras or other imaging devices, to detect and track objects in the surrounding environment. Unlike...
visual fault locator
A device that enables visual tracing of a fiber optic cable to check for breaks and defects by coupling visible light into the cable. Also called fiber tracer.
visual field
The angular field of view that is seen by the eyes when fixed on a point straight ahead. The normal binocular visual field is approximately 130° in diameter.
visual photometer
A photometer that permits visual comparison of the luminance of two surfaces.
visual range
The value of the expanse of b-particles in an absorber, evaluated by visual examination of breaks in the absorption curve.
visual storage tube
An electron tube that stores and visually displays information by means of a cathode-ray-beam-scanning and charge-storage mechanism.
visual test chart
A series of high contrast block letters or similar objects arranged to permit the evaluation of eyesight in humans.
visually coupled airborne systems simulator
A visual system including a tiny television tube and imaging optics, all contained in a helmet to be worn by pilots in flight simulator training.
visually coupled display
->
helmet-mounted display
A compact optical projection system, mounted on or built into a helmet, and used to project data or a scene directly into the eyes of the wearer. Also called visually coupled display.
vitreous
Having the characteristics of glass.
vitreous humor
The transparent fluid that fills the portion of the eye between the eye lens and the retina (the posterior chamber).
vitreous silica
->
fused silica
Glass consisting of almost pure silicon dioxide (SiO2). Also called vitreous silica. Frequently used in optical fibers and windows.
VLBI
very long baseline interferometry
VLD
visible laser diode
VLE
vapor levitation epitaxy
VLF
very low frequency
VLP
video long play
VLSI
very large scale integration
VM
velocity modulation
VME
virtual memory extension
VMM
vector matrix multiplication
VOA
variable optical attenuator
void
A blank area (caused by insufficient inking of the paper) that falls within the range of an intended character stroke in an optical character-recognition system.
Voigt effect
The induced birefringence in isotropic gases that results when the gases are placed in strong fields.
voltage contrast analysis
A nondestructive testing method for very large scale integration circuits, using a scanning electron microscope to monitor changes in the electronic state of the chip as it is fed test voltages while...
voltage multiplier
A device that converts alternating voltage to direct voltage, while at the same time increasing its amplitude.
voltaic cell
An electric cell having two electrodes of unlike metals immersed in a solution that chemically affects one or both of them, thus producing an electromotive force.
volume Bragg gratings
Volume Bragg gratings (VBGs) are specialized optical elements that consist of periodic variations in refractive index throughout the volume of a transparent material, typically a photosensitive glass...
volume hologram
A three-dimensional hologram.
volumetric imaging
Volumetric imaging refers to the capture, visualization, and analysis of three-dimensional (3D) information from a volume of space. Unlike traditional two-dimensional (2D) imaging, which provides...
vortex phase plate
A vortex phase plate is an optical device designed to impart a phase singularity, commonly referred to as a vortex or phase vortex, onto a light beam. This singularity results in a phase profile...
voxel
An element within a three-dimensional data set image.
VPE
vapor phase epitaxy
VPR
vapor phase regrowth
VPRF
variable pulse repetition frequency
VQ
vector quantization
VRML
virtual reality modeling language
VRR
visual radio range
VSTEP
vertical to surface transmission electrophotonic device
VSWR
voltage standing-wave ratio
VTPR
vertical temperature profile radiometer
VTR
videotape recorder
VUV
vacuum ultraviolet
w-type fibers
->
double-clad fiber
Double-clad fiber (DCF) is a specialized optical fiber that features two concentric cladding layers surrounding a core. The design of double-clad fibers allows them to be used in various...
Wadsworth mounting
A system used for gratings that consists of a concave mirror, a grating and a plate holder mounted normal to the grating to reduce astigmatism and spherical aberration. The mounting yields a...
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Photonics Dictionary
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