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8,289 terms
Photonics Dictionary
Clear All Filters x
ns x
TASR
tunable, all-optical signal regenerator
Taylor criterion
States that in interferometers in which the separation of the maxima is equal to the half-value width, a slight drop in intensity between fringes is distinguishable and the fringes can be considered...
Tb/s
terabits per second
TCL
through-camera-lens
TCR
temperature coefficient of resistance
TDAS
tracking and data acquisition system
TDDM
time division demultiplex
TDI
tachometry displacement integration; time delay integration
TDL
tunable diode laser
TDM
time division multiplexing
TDR
time-domain reflectometer
TDRS
tracking and data relay satellite
TDS
time-domain spectroscopy
TE
thermoelectric; transverse electric
TEA
transversely excited atmosphere
tearing
In television, a lateral displacement of the lines from their normal position due to the instability of a synchronizing circuit. Visually, it appears as though parts of the images had been torn away.
technicolor
The color process that is used to form positive color cine films by dye transfer or imbibition, based on the use of separate matrices that superimpose yellow, magenta and cyan dye images on the final...
tee coupler
A passive coupler that connects three ports.
TELD
transferred electron device
telemeter
1. The term used to describe any of the many instruments used to remotely record physical dimensions, such as strain, temperature or pressure, and transmit this data to a receiving station. 2. A...
telemetry
The science of sensing and measuring information at some remote location and transmitting the data to a convenient location for reading or recording.
telephoto magnification
->
telephoto ratio
In a telephoto lens, the ratio of the overall length to the focal length of the lens. It is generally about 0.8 to 0.9 in magnitude.
telephoto power
The ratio between the focal length of a lens having a longer focal length than that of the standard lens used with a camera, and the focal length of the standard lens. It is used to provide an...
telephoto ratio
In a telephoto lens, the ratio of the overall length to the focal length of the lens. It is generally about 0.8 to 0.9 in magnitude.
telephotography
1. A method of photographing distant objects with a lens of long focal length. 2. The reproduction of photographs over a distance by means of electricity.
telephotometer
An instrument used to measure the luminance (brightness) of a distant object. The object is viewed through a small telescope, and a mirror in the focal plane reflects an internal illuminated surface...
telephotometry
The principles and techniques involved in the use of telephotometers to measure atmospheric extinction.
telepresence
The use of head-mounted displays and body-operated remote actuators to control distant machinery. Provides a virtual environment for humans to control devices, robots, etc., in a hostile real...
teleradiography
A method of taking radiographs at a distance from the object being photographed to decrease distortion.
telescope
An afocal optical device made up of lenses or mirrors, usually with a magnification greater than unity, that renders distant objects more distinct, by enlarging their images on the retina.
telescope exit pupil
The image of the aperture stop, usually the objective lens, that is produced by the eye lens. When the exit pupil of the telescope coincides with the entrance pupil of the eye of the observer, the...
telescope mount
The base used to hold an astronomical telescope. It may be either altazimuth, with horizontal and vertical axes of rotation, or equatorial, with one axis parallel to the Earth's axis of rotation and...
telescopic sight
->
riflescope
A small erect-image telescope for use as a sighting device on a rifle. The chief requirement is a long eye relief to avoid damage to the eye due to recoil. The power may lie anywhere between 1 and...
televise
To transform a picture or image field into a television signal for transmission.
television aperture
The term that represents the size of one of the many small elements into which a television image is necessarily broken down for transmission.
television bandwidth
The span of frequencies within which a single channel of broadcast television must fall; in the US, it is 6 MHz.
television camera
A camera containing an electronic image sensor that converts the image to an electronic signal suitable for television applications.
television line number
The value equal to the raster height divided by the half-period of a periodic test pattern.
television microscope
A device designed to enlarge the image of a microscopic object by television process. It may be a flying spot scanner that is used to scan the microscope slide, or a camera tube-microscope...
television monitor
A television receiver that receives the signals generated by a television camera directly, or remotely through a radio signal. It may be used to continuously check image and sound reception; as a...
television projection
A television display system in which the television signal is converted to an image that is projected onto either a front or rear projection screen.
television signal
The combination of the audio and visual signals that are transmitted and received at the same time, correlating the scene and sound in a television picture.
television waveform
The graph of the oscillating variations composing the wave of a video signal.
tellurium
The material favored for study of interaction of high-acoustic intensities with free carriers. Tellurium is the semiconductor with the largest piezoelectric constants. Tellurium oxide is the material...
teloscopy
Teloscopy, while not a commonly used term, could be understood in the context of principles related to telescopes and their applications in observation and measurement. If we interpret teloscopy as...
TEM
transmission electron microscope; transverse electromagnetic
tempered glass
A glass that is heated, then chilled (usually by an air blast) to set up internal stresses so that the surfaces are under compression. This strengthens the glass, since glass breaks only in tension,...
temporal coherence
A characteristic of laser output, calculated by dividing the speed of light by the linewidth of the laser beam. The temporal coherence length of different lasers thus varies from a few centimeters to...
temporal disperser
->
streak camera
A streak camera is a specialized instrument used to capture and analyze ultrafast phenomena, such as extremely short pulses of light or rapidly changing events. Unlike traditional cameras that...
temporal Fourier hologram
A technique used to suppress extreme noise amplification during digital image reconstruction that relies on smoothing and differentiation of the data by simplified least squared procedures.
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Photonics Dictionary
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