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8 terms
Photonics Dictionary: P
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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.
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...
photoelectric multiplier
A phototube in which the primary photoemission current, before being extracted at the anode, is multiplied many times.
Photonics Dictionary
P
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