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21 terms
Photonics Dictionary: V
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visual x
V x
visual acuity
The numerical definition of the ability of an observer to perceive fine detail. The average value may be taken as one minute, or 6.7 cycles/mm, at 250 mm (normal viewing distance).
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 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.
VAMP
visual-acoustic-magnetic pressure
VAR
visual aural range
VCASS
visually coupled airborne systems simulator
vergence
The angular relation between two light rays that originated at the same object point. Sometimes used to indicate the angle between the visual axes of the eyes.
VIDAT
visual data acquisition
videography
Videography refers to the process of capturing moving images and recording them in a digital format. It involves the use of video cameras, lighting equipment, and audio recording devices to create...
visibility meter
1. An instrument used to determine the visual range in an environment. 2. A type of photometer that artificially reduces an object's visibility to threshold limits and records the quantity of...
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...
VRR
visual radio range
Photonics Dictionary
V
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