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8,726 terms

Photonics Dictionary

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.

telephoto lens

A compound lens so constructed that its overall length is equal to or less than its effective focal length.

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 lens

A telescope lens is a primary optical component of a telescope system that gathers and focuses light to form an image. It is typically a curved, transparent piece of glass or other optical material...

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 transmitter

An electronic device used to encode video and audio signals of a television camera into radio waves that are broadcast to remote receivers. The video and audio components are transmitted...

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

TEM₀₀ -> 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...

temperature decay method -> 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...

temperature sensors

Temperature sensors in optics are crucial for monitoring and controlling thermal effects that can significantly impact optical components and systems. Here’s how temperature sensors work and...

temperature-sensitive coating

A coating having pigments that change color when exposed to heat. This effect has been widely used to monitor hot spots in mechanical parts.

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.

temporal response

Characteristic of deflected light power defined as the quadratic invariant function of the video signal amplitude.

tensile loading -> proof stressing

A means of testing the strength of optical fibers to ensure reliability, by applying stress to the fiber so that any flaws generated during manufacturing or handling result in breakage of the fiber.

TEO

transferred electron oscillator

TEP

transparent electrophotographic

TER

total external reflectance

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Photonics Dictionary

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