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40 terms
Photonics Dictionary: P
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photoelectric x
P x
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
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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
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phototube
An electron tube having a photocathode for the emission of a photoelectric current.
photoemission
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photoelectric emission
The electron emission from a substance or instrument whose surface has been bombarded by a suitable amount of radiation.
photoemissive effect
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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.
PEC
photoelectric cell
PES
photoelectric scanner
photocathode luminous sensitivity
The responsivity of a photocathode to luminous energy equal to the ratio of the photoelectric emission to the incident luminous flux.
photocathodes
Photocathodes are specialized materials or surfaces that exhibit the photoelectric effect, wherein the absorption of photons leads to the emission of electrons. When photons with sufficient energy...
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...
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...
photoelectron
Electron released in photoelectric activity.
photoemissive tube photometer
A photometer that uses a photoemissive tube to detect and measure light. See photoelectric photometry.
photomultiplier tube
A photomultiplier tube (PMT) is a highly sensitive vacuum tube that detects and amplifies low levels of light. It is widely used in various applications where high sensitivity, fast response times,...
phototelegraphy
A document-transmitting process that uses a cylinder that rotates the document to be scanned and detected by a photoelectric cell. The cell transforms the light into electrical energy that may be...
phototube
An electron tube having a photocathode for the emission of a photoelectric current.
phototube relay
A photoelectrical relay that uses a phototube as its photoelectric device to open and close an electrical relay; used to activate counters and safety controls.
Photonics Dictionary
P
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