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Photonics Dictionary: T

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t
torr
T
transmission; tesla; tera-
t number
The equivalent f number of a fictitious lens that has a circular opening and 100 percent transmittance, which would give the same central illumination as the lens being considered: where...
T stop -> t number
The equivalent f number of a fictitious lens that has a circular opening and 100 percent transmittance, which would give the same central illumination as the lens being considered: where...
t-number
transmission number
T/R
transmit/receive unit
TAB
tape automated bonding
table
See honeycomb table; indexing table.
tachometer
An instrument designed to measure the rate of rotation of components, such as shafts.
TAI
Temps Atomique International
talbot
One lumen-second, the SI unit of the quantity of light.
Talbot's bands
The series of interference bands that appear in the spectrum when a specified glass plate is inserted into a spectroscope, from the side of the blue portion of the spectrum, so that the plate...
Talbot's law
The law stating that the brightness of an object that is examined through a slotted disc, rotating over a critical frequency, is proportional to the angular aperture divided by the opaque sectors.
tan
tangent of
tangent ogive
In optics, a shape often given to the leading edge of a projectile. In any side view it appears as a pointed arc, while any cross section perpendicular to its long axis appears as a circle.
tangential distortion
Optical aberration such that image magnification varies with ray distance from the optical axis in a radial distortion.
tanh
hyperbolic tangent
TAP
target angular position
tap
A device for extracting a portion of the optical signal from a fiber.
tapered transmission line -> tapered waveguide
A waveguide having a characteristic that is altered continuously with the distance traveled, relative to the axis of its path.
tapered undulator -> undulator magnet
A device used in a free-electron laser to convert the electron-beam's energy into microwave laser radiation by creating a magnetic field of alternating polarity through which the free electrons are...
tapered waveguide
A waveguide having a characteristic that is altered continuously with the distance traveled, relative to the axis of its path.
target
1. The anode or anticathode of an x-ray tube that emits x-rays when bombarded by electrons. 2. The screen in a television imaging tube that is scanned by an electron beam to determine the...
target angular position
Measurement estimated from the position of the image's centroid.
target size and orientation
Angular tracking measurement estimated from the properly normalized image second-moment tensor.
TAS
target acquisition system
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
TEA laser -> transversely excited atmosphere laser
Also known as TEA laser. A coherent optical source with a wide wavelength range in the infrared, visible and ultraviolet that uses an electrical discharge transverse to (across) the optical axis to...
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
telecentric lens
There are three types of telecentric lenses: -Image-space telecentric lenses are those in which the aperture stop is located at the front focus, resulting in the chief rays being parallel to the...
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.
teleobjective -> telephoto lens
A compound lens so constructed that its overall length is equal to or less than its effective focal length.

Photonics DictionaryT

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