photomultiplier


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photomultiplier:

see photoelectric cellphotoelectric cell
or photocell,
device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident upon it. The most common type consists of two electrodes separated by a light-sensitive semiconductor material.
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photomultiplier

(foh-toh-mul -tă-plÿ-er) (photomultiplier tube; phototube) An electronic device used to convert a low-intensity light signal into an electrical signal and to amplify this signal very considerably. It contains a photocathode from which electrons are liberated by the incident light photons. The electrons are accelerated down an evacuated tube by a series of positively charged electrodes to which an increasingly high potential is applied. At each electrode a number of additional electrons are released by each impacting electron (by secondary emission). The electrons are all collected at the final electrode in the chain, which is held at a very high potential, and a large current pulse is produced.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

photomultiplier

[¦fōd·ō′məl·tə‚plī·ər]
(electronics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The photomultipliers collect Cerenkov light, a pale blue light emitted by particles traveling as fast as light through water.
Photomultiplier tubes operate at high voltage, usually supplied by a separate power source, and my RCA model 931A requires -1,000 volts DC.
A bolder idea is to drill 2-km-deep holes and instrument the lower half of each string with 100 photomultiplier tubes.
"That brought in the need for careful mirror design and high-quality photomultiplier tubes."
It uses a high intensity, polychromatic light source and high sensitivity photomultiplier. ESA, Inc.
For example, 67 cylindrical detectors, each outfitted with a large mirror that focuses light onto several photomultiplier tubes, sit atop a hill at the Army's Dugway (Utah) Proving Ground.
The instruments contain high-efficiency matched optics systems, with each channel's laser and photomultiplier tube controlled independently through the full range.
The TriplePro incorporates proprietary data acquisition software for use with either high performance Roper Scientific CCD detectors, or in the scanning mode with photomultiplier robes and NCL control electronics.
The second stage of DUMAND, the actual instrument, will consist of 208 photomultiplier detectors, distributed among nine strings each 330 meters long.