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Photonics Dictionary

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...
transit -> surveying instruments
Instruments used for measuring angles and occasionally lengths on the ground. The principal surveying instruments are the level, the stadia telescope, the transit and the theodolite. Laser...
transition
The process whereby a quantum mechanical system alters from one energy level to another. During this process, energy is emitted or absorbed, and it usually takes the form of photons, phonons, or...
transition metal
Transition metals are elements found in the d-block of the periodic table, which includes groups 3 to 12. They are characterized by their partially filled d orbitals in the electron configuration....
translucent
Pertaining to materials having the property of reflecting a part and transmitting a part of the incident radiation.
translucent screen
A screen composed of a sheet of diffusing plastic material that reveals excellent image detail for close viewing. It is efficient for use with microfilm readers.
transmission efficiency
Measure of the amount of light that is transmitted, relative to the amount lost by absorption or reflection.
transmission electron microscope
A transmission electron microscope (TEM) is a powerful microscopy technique that uses a beam of electrons to create high-resolution images of extremely thin samples. In a TEM, electrons are...
transmission grating
A transparent diffraction grating that serves to transmit light.
transmission hologram
A hologram that is illuminated by a source opposite the viewer.
transmission limit
A restricting wavelength above or below which a specified form of radiation is totally almost absorbed by a specified medium.
transmission loss
The decrease in power that occurs when an optical beam or signal is transmitted through a system.
transmission plane
In polarized light, the plane of vibration that a polarizer will transmit.
transmission sphere
A precision lens designed to convert the plane wavefront output of an interferometer to a spherical wavefront for the testing of curved (spherical) surfaces.
transmission window -> spectral window
A wavelength region of relatively high transmittance, surrounded by regions of low transmittance.
transmission
In optics, the conduction of radiant energy through a medium. Often denotes the percentage of energy passing through an element or system relative to the amount that entered. See transmission...
transmissivity
The internal transmittance per unit thickness of a nondiffusing material.
transmissometry
The methods used to determine the extinction characteristics of a medium.
transmittance
The ratio of the radiant power transmitted by an object to the incident radiant power.
transmitter central wavelength range
The central wavelength range of a transmitter based on the worst-case scenarios of temperature, manufacturing and other variations.
transmitter
In fiber optic communications, a light source whose beam can be modulated and sent along an optical fiber, and the electronics that support it.
transparency
An image affixed to a transparent photographic film or plate by photographic, printing or chemical methods. It may be viewed by transmitted light.
transparency illuminator
A metal box with an opal glass front enclosing a lamp, used for viewing color transparencies or x-ray films.
transparent
Capable of transmitting light with little absorption and no appreciable scattering or diffusion.
transparent electrophotographic films
Imaging materials that generally consist of a polyester base, a transparent electrically conductive layer and an organic photoconductive top coating. When charged and exposed to light, an...
transponder
A receiver-transmitter device that automatically transmits a signal when the proper interrogating signal is received.
transport shift register
The element in a charge-coupled device that receives the charge packets transferred from the line of sensor sites and then delivers the image data to the device's output circuitry.
transport theory approximations
Multiple scattering method used in biological analysis in which approximations yield simple, explicit solutions, at least for slab geometry. The approximations are usually differential equations...
transposition
In optics, the changing of the relative curves of a lens without changing its refractive value.
transputer
A computer whose architecture contains several CPU chips arranged in parallel. Often used in image processing systems.
transverse chromatic aberration
An alternate term for lateral chromatic aberration. See chromatic aberration.
transverse coherence -> spatial coherence
The maintenance of a fixed-phase relationship across the full diameter of a cross section of a laser beam.
transverse electric mode -> transverse mode
In the context of optics and lasers, a transverse mode refers to a specific spatial pattern of the electric field within the cross-section of a laser beam. These modes represent the different...
transverse electromagnetic mode -> transverse mode
In the context of optics and lasers, a transverse mode refers to a specific spatial pattern of the electric field within the cross-section of a laser beam. These modes represent the different...
transverse field modulator
A Pockels cell in which electrical current is applied in a direction orthogonally to that of the light beam.

Photonics Dictionary

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