photomultiplier

Use Photomultiplier in a sentence

photomultiplier

[foh-tuh-muhl-tuh-plahy-er]
noun
an extremely sensitive detector of light and of other radiation, consisting of a tube in which the electrons released by radiation striking a photocathode are accelerated, greatly amplifying the signal obtainable from small quantities of radiation.

Origin:
1935–40; photo- + multiplier

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
photomultiplier (ˌfəʊtəʊˈmʌltɪˌplaɪə)
 
n
a device sensitive to electromagnetic radiation, consisting of a photocathode, from which electrons are released by incident photons, and an electron multiplier, which amplifies and produces a detectable pulse of current

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
photomultiplier   (fō'tō-mŭl'tə-plī'ər)  Pronunciation Key 
An electrical device designed for the detection of weak electromagnetic radiation, usually light, by amplifying the energy of the photons that strike it into stronger electrical signals. Photomultipliers are used in night-vision technology and in telescopes to detect light not strong enough to be visible by the unaided eye. ◇ The most common photomultiplier is the tube photomultiplier; it exploits secondary emission of electrons in a vacuum tube in the manner of an electron multiplier. When radiation strikes the cathode of a tube photomultiplier, electrons called photoelectrons are emitted and attracted to positively charged electrodes called dynodes. When they collide with the dynode, more electrons are released; these are in turn attracted to another dynode at a higher voltage to release yet more electrons, and so on. At the end of this process, there is a current flow at the anode that is strong enough to be easily detected.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Photomultiplier tubes detect the light and convert it into an electric signal, which is amplified and sent to a computer.
The photomultiplier tubes translate the light into a voltage.
The photomultiplier tube bias voltage must be adjusted to maximize signal but minimize dark current.
Sensitive photomultiplier tubes line the detector walls, ready to amplify and record the telltale flashes.
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