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photomultiplier
[ foh-tuh-muhl-tuh-plahy-er ]
/ ˌfoʊ təˈmʌl təˌplaɪ ər /
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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.
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Origin of photomultiplier
First recorded in 1935–40; photo- + multiplier
Words nearby photomultiplier
photomicroscope, photomontage, photomorphogenesis, photomosaic, photo-mount, photomultiplier, photomural, photon, photonasty, photonegative, photoneutron
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use photomultiplier in a sentence
If you think back to the example of putting a bucket outside during a rainstorm, these photomultipliers are like buckets that are so sensitive they can capture — and record — a single raindrop in a light drizzle.
Explainer: Telescopes see light — and sometimes ancient history|Trisha Muro|January 13, 2022|Science News For StudentsTo spot the small amounts of light left behind by individual particles, scientists use photomultiplier tubes, originally invented in the 1930s, which convert light into electrical signals.
How particle detectors capture matter’s hidden, beautiful reality|Emily Conover|August 5, 2021|Science NewsThe tube is equipped with a mounting bezel to accept a camera or photomultiplier device.
Preliminary Specifications: Programmed Data Processor Model Three (PDP-3)|Digital Equipment Corporation
British Dictionary definitions for photomultiplier
photomultiplier
/ (ˌfəʊtəʊˈmʌltɪˌplaɪə) /
noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for photomultiplier
photomultiplier
[ fō′tō-mŭl′tə-plī′ər ]
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
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