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Excelitas Technologies Corp. - X-Cite Vitae MR 11/24

8,726 terms

Photonics Dictionary

photodarlington

A Darlington current amplifier consisting of two separate transistors, of which a phototransistor is the input device.

photodetector

A photodetector, also known as a photosensor or photodiode, is a device that detects and converts light into an electrical signal. Photodetectors are widely used in various applications, ranging from...

photodielectric effect

The effect, present in particular phosphors, that is defined as a transformation in the dielectric constant of a material when illuminated.

photodiffusion effect

The potential difference between two areas of a semiconductor when one is exposed to light.

photodiode detector

A photodiode detector is a semiconductor device that converts light into an electrical current. It operates based on the principle of the photoelectric effect, where photons of light incident on the...

photodiode

A two-electrode, radiation-sensitive junction formed in a semiconductor material in which the reverse current varies with illumination. Photodiodes are used for the detection of optical power and for...

photodischarge spectroscopy

A spectroscopic process that detects and analyzes the discharge from an extrinsic surface with less than bandgap light. This method may determine the extrinsic surface-state energy levels of a...

photodynamic inactivation

Photodynamic inactivation (PDI) is a therapeutic approach that utilizes the combination of light, a photosensitizer, and molecular oxygen to induce cell death or inactivate microorganisms. This...

photodynamic therapy

A medical technology that uses lasers or other light sources in combination with photosensitizing drugs to treat cancerous tumors.

photoelastic constant

A formulaic description of the linear change of the reciprocal optical dielectric tensor with either stress or strain.

Photoelastic equipment and supplies

Photoelastic equipment and supplies refer to instruments and materials used in photoelasticity, a technique used to analyze stress distribution and behavior in materials. photoelastic equipment...

photoelastic

In optics, the double refraction that is produced when stress is applied to a transparent material. Plastics, which are especially photoelastic, can be formed into models of structures that are...

photoelasticity

The process of determining, with the aid of plane-polarized light, the stress distribution in materials under complex systems of loading.

photoelectric absorption

The transformation of incident radiant energy into a photoelectric emission current.

photoelectric cathode

A cathode principally designed to emit a photoelectric current.

photoelectric colorimeter

A system having a photoelectric detector for the measurement of three quantities related by linear combination to tristimulus values of a sample.

photoelectric colorimetry

The measurement and analysis of color using a photoelectric instrument having three filters with broad spectrum bands.

photoelectric constant

The constant that, multiplied by the frequency of the radiation-producing emission of photoelectrons, determines the amount of voltage each photoelectron absorbs.

photoelectric control

The control of an instrument or electrical circuit by the current produced by varying radiation incident to a photoelectric cell.

photoelectric counter

A device used to count objects that pass a given point by allowing each object to obstruct a beam of light falling on a photocell. Slow counting rates can be recorded by a mechanical counter, but...

photoelectric current

The electron stream emitted by a phototube when the cathode is exposed to light.

photoelectric densitometer -> densitometer

1. An instrument used to measure the opacity or density of dyes, pigments or dispersed particles that form an image in or on a medium, such as a photographic film. 2. A device used to measure the...

photoelectric effect

The emission of an electron from a surface that occurs when a photon impinges upon the surface and is absorbed. This effect is the means by which photons may be detected.

photoelectric emission

The electron emission from a substance or instrument whose surface has been bombarded by a suitable amount of radiation.

photoelectric exposure meter

A device consisting of a microammeter, a photovoltaic cell and a battery. It is used for the measurement of scene brightness and the determination of correct exposure for photographic processes.

photoelectric fluorometer

A filter fluorometer that uses a photomultiplier tube to detect the fluorescence of a sample.

photoelectric mixing

Also known as light beating. The mixing of two narrowband optical components to produce an AC component in the photocurrent at the optical difference frequency.

photoelectric multiplier

A phototube in which the primary photoemission current, before being extracted at the anode, is multiplied many times.

photoelectric photometer

Also known as electronic photometer. A photometer with a photocell, phototransistor or phototube for measuring the intensity of light.

photoelectric photometry

The use of photoelectric sensors to detect and measure the intensity of a light source. This application, as compared to human observation, results in higher speeds of operation, a greater...

photoelectric pyrometer

An instrument used to measure the temperature of a source through the use of photoelectric cells to detect and measure the intensity of the light emitted by the source.

photoelectric reader

An input device for a computer that detects and reads the data, in the form of punched holes in cards, by light that is transmitted through the holes.

photoelectric receiver

An instrument that uses a photocell to detect and measure the intensity of incident light.

photoelectric reflectometer

A photoelectric photometer used to measure the reflectance of a surface.

photoelectric relay

A relay that opens or closes an electrical circuit depending on the intensity of the light incident to a photoelectric device contained in the relay.

photoelectric scanner

A system mounted a few inches above a moving plane that consists of a light source, lenses and one or more phototubes. In this position, the scanner actuates the control equipment when the quantity...

photoelectric sensitivity

That property of a material that determines its ability to release electrons when absorbing photons.

photoelectric spectrophotometer

A system that consists of a spectrophotometer with a photoelectric detector for measurement of radiant energy.

photoelectric tube -> phototube

An electron tube having a photocathode for the emission of a photoelectric current.

photoelectromagnetic effect

Interaction of a magnetic field with a photoconductive substance exposed to light to create a potential difference.

photoelectromotive force

The force that stimulates the emission of an electrical current when photovoltaic action creates a potential difference between two points.

photoelectron holography

A technique proposed for studying the atomic structure of crystals by measuring the interference pattern generated when the crystal is illuminated by a burst of finely tuned x-rays. The resulting...

photoelectron microscopy

Surface analysis by means of photon induced electron emission. PEM methods provide high lateral resolution of the observed sample.For surface material sciences PEM allows the investigation of...

photoelectron

Electron released in photoelectric activity.

photoemission -> photoelectric emission

The electron emission from a substance or instrument whose surface has been bombarded by a suitable amount of radiation.

photoemissive cell -> photoemissive detector

An electronic tube instrument in which the anode current varies with the intensity of light incident on the cathode.

photoemissive detector

An electronic tube instrument in which the anode current varies with the intensity of light incident on the cathode.

photoemissive effect -> photoelectric effect

The emission of an electron from a surface that occurs when a photon impinges upon the surface and is absorbed. This effect is the means by which photons may be detected.

photoemissive tube photometer

A photometer that uses a photoemissive tube to detect and measure light. See photoelectric photometry.

photoemulsion

In photolithography, an opaque material used in masks that has a lower optical density and grainier composition than chrome.

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Photonics Dictionary

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