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Excelitas PCO GmbH - PCO.Edge 11-24 BIO MR

AdTech Ceramics - Ceramic Packages 1-24 HP

8,726 terms

Photonics Dictionary

sensitized fluorescence

The optical energy transfer between ions of differing atoms.

sensitometer

An instrument for determining the sensitivity of a photographic film to light. The film is given either a stepped exposure or a continuously varied exposure; after processing, the density is measured...

sensitometry

Primarily the measurement of photographic sensitivity of certain materials such as photographic film. It refers to the measurement of the response of photographic materials, after exposure, to forms...

sensor

1. A generic term for detector. 2. A complete optical/mechanical/electronic system that contains some form of radiation detector.

separate absorption and multiplication region avalanche photodiode

An avalanche photodiode in which the light-absorbing area is a low-bandgap material and the PN junction is placed in an area of high-bandgap material, reducing dark current and increasing gain.

separation filters

Three filters used in making a color print of a color negative, red, green and blue-violet, respectively. Each filter transmits about one-third of the visible spectrum onto the print.

sequence camera

A type of motion-picture camera in which single frames are photographed either automatically at a predetermined rate (as slow as one frame per minute or hour), or whenever the operator presses a key....

sequential color transmission

With respect to television, the transmission of the signals that originate from variously colored parts of an image in a particular sequential order.

sequential scanning

Raster scanning process like that of television: each line is scanned successively.

SERCOS

serial real-time communications system

SERI

Solar Energy Research Institute

serial scanning -> rectilinear scanning

The scanning of a region in a given sequence of slender, straight parallel strips.

serial transmission

A mode of data transmission whereby each bit is generated in sequence on a single carrier.

serioscopy

A variation of tomography, which is a means of visualizing any one of a large set of parallel planes in the patient. A series of x-ray pictures taken from different angles results in developed...

SERODS

surface-enhanced Raman optical data storage

serpentine bend mode filter

A device used in measuring attenuation in optical fiber. The loss caused by the bends in a short reference length of fiber approximates that of a much longer fiber under test.

SERS

surface-enhanced Raman spectroscopy

servo motion

Servo motion is the controlled motion of a mechanical system achieved through the use of a servo motor, which utilizes feedback mechanisms to ensure accurate positioning, speed, and acceleration....

servo

A servo, short for servomechanism or servo motor, is a closed-loop control system that precisely controls the position, velocity, or acceleration of a mechanical component, typically in response to...

servomechanism

A closed-loop system that is constantly adjusted in response to input signals generated within the system.

SESAM

semiconductor saturable absorber mirror

SEW

surface electromagnetic waves

sextant

A handheld navigational instrument used to measure the elevation angle of celestial bodies such as the sun. An image of the sun is viewed through a small telescope via two plane mirrors so that any...

SEY

secondary electron yield

SFB

semiconductor functional block

SFF

small form factor

sfm

surface feet per minute

single heterostructure

Shack-Hartmann wavefront sensor

The Shack-Hartmann wavefront sensor is an optical device used for measuring the wavefront aberrations of an optical system. It is widely used in adaptive optics systems to correct distortions and...

shading

1. The sorting of lenses by their color. 2. In an optical system, an irradiance or brightness gradient in the image that is not present at the object.

shadow mask -> aperture mask

Also known as a shadow mask, a perforated plate placed between the focusing and accelerating electrodes, and the tricolor phosphor screen in a color-television tube.

shadow mask tube

A type of color-generating cathode-ray tube that uses a shadow mask, a thin perforated electrode, located close to the display screen. Each hole in the mask coincides with a triad of three phosphor...

shadowgraph

A method of demonstration or examination using a point source illumination without the use of any projection lens between the object and its shadow, the shadow being cast on a distant screen.

shallow

A term used to denote a concave surface having too long a radius of curvature. That is, its negative power is too small or low.

Shannon's sampling theorem -> finite sampling theorem

A finite version of Shannon's sampling theorem that states that a class of functions can be reconstructed exactly by a sufficient number of spectral samples; the reconstructed function is an explicit...

sharp

A term used to describe a convex surface having too short a radius of curvature. To correct this condition, material is cut from the outer portion of the polishing tool.

sharp height

The distance between the base and the vertex before the edging of a prism.

sharpness index

A function of the intensity distribution in an image aberrated by a quadratic curvature wavefront distortion.

shear

Image distortion that occurs when the axes of the original image are not perpendicular in the resulting image, making the resulting image appear slanted. Shear can be caused by movement of the...

shearing interferometer

An interferometer in which interference is produced between wavefronts that are sheared in the sample object by a small lateral distance.

sheathing -> jacket

The outer material that surrounds and protects the buffered and unbuffered fibers in an optical cable.

sheet grating

A three-dimensional grating designed with thin metal sheets to remain opaque to all but one specific and predetermined wave.

sheet polarizer

A sheet of plastic material containing microscopic crystals of herapathite or some other similar substance that transmits light polarized in one direction, but absorbs light polarized in a...

SHF

super high frequency

SHG

second-harmonic generation

shift register -> 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.

shining -> clearing

Also called shining. Grinding and polishing one surface of a blank to permit a more thorough examination for quality.

shock wave

Interruption in the normal flow of a plasma or fluid characterized by sharp rises in velocity, temperature and pressure. As the shock passes into a gaseous compound, gas particles are heated and...

short finish

A term that describes an incomplete polish.

short wavelength infrared

Short wavelength infrared (SWIR) refers to the portion of the infrared spectrum that encompasses wavelengths roughly between 1,000 and 3,000 nanometers (nm). In the electromagnetic spectrum, infrared...

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Photonics Dictionary

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