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8,726 terms

Photonics Dictionary

TO
transistor outline
TO package
Housing that resembles a small metal can for a semiconductor component, photodetector or similar device.
TODS
transportable optical disc system
TOF
time of flight
token
In a local area network, a unique signal that travels from one node or station to another, providing them serially with access to the network for sending data.
tolerance field
In fiber optics, the annular region between two concentric circles; used to specify fiber cladding and core sizes.
tolerancing
The determination of the degree to which a manufactured component can deviate from its ideal specifications of material and geometry without impairing its performance.
tomography
Technique that defocuses activity from surrounding planes by means of the relative motions at the point of interest.
tomosynthesis
A variation of tomography in which several photographs of a patient are taken at different angles, and back-projection of the resulting radiographs produces light distribution in a chosen...
tonality
The distribution of gray-scale values in an image.
Topogon lens
A symmetrical, very wide-angle lens. Well-corrected for spherical aberration and color, the Topogon can cover fields up to 90° at speeds from f/11 to f/6.3.
topological photonics
Topological photonics is a branch of physics and optics that explores the application of topological concepts to the behavior of light in photonic systems. Drawing inspiration from the field of...
topology
Topology is a branch of mathematics that focuses on the properties of space that are preserved under continuous deformations, such as stretching, crumpling, and bending, but not tearing or gluing....
toric lens
A lens having one or more toric surfaces. A toric surface is one having a maximum power in one meridian and a minimum power in a perpendicular meridian. In ophthalmic optics, toric lenses are used to...
toric surface
A surface that is swept out by revolving a circle about an axis that lies in the plane of the circle but that does not intersect its center. The result is a surface having different curvatures in...
torque
A calculated measure of the ability of an incident force to cause an object to spin. The spin speed of any given object is a direct function of the duration of the torque application.
torr
A unit of pressure of 1 mm Hg, equivalent to 133 P. One atmosphere = 760 torr. (t).
TOSA
transmitter optical subassembly
total flux
The luminous flux emitted by a light source in all directions.
total image runout
Image displacement by a decentered lens, rotated on a chuck whose axis of rotation passes through the geometrical center of the rim of the lens, when the light source is at an infinite distance. It...
total insert
The lateral distance between a vertical line drawn through the geometrical center of the distance portion of a multifocal, and a vertical line penetrating the geometrical center of the segment.
total internal reflection fluorescence
Total internal reflection fluorescence (TIRF) microscopy is an advanced fluorescence microscopy technique that leverages the principle of total internal reflection to selectively illuminate and image...
total internal reflection
The reflection that occurs within a substance because the angle of incidence of light striking the boundary surface is in excess of the critical angle.
total radiation pyrometer
Also known as a pyrradiometer. An instrument that is designed to measure heat radiation nonselectively; e.g., the combination of terrestrial and solar radiation.
tourmaline
A naturally occurring crystalline mineral that has the property of polarizing transmitted light. It is little used now that the Polaroid sheet is available.
Touschek effect
Effect whereby two electrons lose synchronism with the accelerating field and are lost during synchronous radiation. The effect is produced by the scattering of the electrons that are oscillating in...
TOW
tube-launched optically tracked wire-guided
TPE
thermoplastic elastomer
TPEF
two-photon excited fluorescence
TPF
two-photon fluorescence
TPI
tracks per inch
TPON
telephony on passive optical network
TPP
two-photon polymerization
TPR
thermoplastic recording
TPV
thermophotovoltaic
TQM/SPC
total quality management/statistical process control
trace
In a cathode-ray tube, the visible line or lines formed on the screen by the deflection of the electron stream.
tracking
1. The process of following an object's movement; accomplished by focusing a radar beam on the reticle of an optical system on the object and plotting its bearing and distance at specific intervals....
tracking accuracy
Measurement of a translation stage's deviation from absolute straightness, that is, its angular motion in both the vertical and the horizontal planes.
tracking system
A controlled motion system that may use a telescope, camera or antenna to follow accurately a satellite, missile, vehicle or other device in response to radar, radio or computer signals.
TRACON
terminal radar control
transceiver
An instrument or system capable of both transmitting and receiving a signal.
transducer
A transducer is a device or component that converts one form of energy into another. It is commonly used in various fields, including electronics, acoustics, and instrumentation, to facilitate the...
transfer blocking
A process used to control thickness and parallelism precisely during the production of plane-parallel plates. Elements are cemented to a blocking tool and their upper surfaces are polished. A second...
transfer function
The complex function, H(f), equal to the ratio of the output to input of the device as a function of frequency. The amplitude and phase responses are, respectively, the magnitude of H(f) and the...
transfer gate
A single long gate electrode that transfers the line of charge packets to the transport shift register in a charge-coupled device.
transfer rate
The rate at which data can be read from a CD-ROM.
transient -> current transient
A sudden, brief increase in current or voltage in a circuit that can damage sensitive components and instruments. Preventive measures include slow-starter circuits, filtering and static control.
transient calorimetric technique
A method of measuring total hemispherical emissivity of the plane surface of a solid that consists of thermally isolating a specimen of the material inside a vacuum, preheating it slightly above the...
transistor
An electronic device consisting of a semiconductor material, generally germanium or silicon, and used for rectification, amplification and switching. Its mode of operation utilizes transmission...

Photonics Dictionary

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