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.

photomultiplier

[¦fōd·ō′məl·tə‚plī·ər]
(electronics)
References in periodicals archive ?
It is lined on the top, walls and bottom by 11 129 gigantic blue-sensitive photomultiplier tubes.
The photomultipliers collect Cerenkov light, a pale blue light emitted by particles traveling as fast as light through water.
Photodiodes could be developed to replace the photomultipliers that are used in positron emission tomography scanning.
Near the bottom of the hole, where the photomultipliers are embedded, the pressure reaches some 200 atmospheres.
In most parts of the ocean, such radioactive elements are so dilute that Cherenkov radiation can be detected only with the most sensitive photomultipliers.
CORK, Ireland -- SensL, the world's leading supplier of silicon photomultipliers, today is announcing the SL family of silicon photomultipliers (SPMs).
Eleven chapters are: CdZnTe and CdTe crystals for medical applications; Monte Carlo modeling of x-ray detectors for medical imaging; medical x-ray and CT imaging with photon-counting detectors; pixelated semiconductor and parallel ASIC design for spectral clinical radiology; silicon photomultipliers in detectors for nuclear medicine; imaging technologies and potential clinical applications of photon-counting x-ray computed tomography; photon-counting detectors and clinical applications in medical CT imaging; radiation detection in SPECT and PET; review of detectors available for full-field digital mammography; grating-based phase-contrast x-ray imaging technique; emerging concept in nuclear medicine: the voxel imaging PET (VIP) project.
Such air showers cause atmospheric nitrogen to fluoresce, and this light was captured by the photomultipliers in the Fly's Eye telescopes.
Unglamorous but indispensable, this technology drives everything from lasers to particle accelerators to photomultipliers.
The photomultipliers record the Cherenkov light, and by whatever tubes are triggered in a given ever the computer program can calculate the direction from which the neutrino came.
Excelitas Technologies, a global technology leader focused on delivering innovative, customized optoelectronics to OEMs seeking high-performance technology solutions, announced today that it has achieved record, world-class performance results for high photon detection efficiency (PDE) and low dark counts in the development and commercialization of its solid state silicon photomultipliers (SiPMs) technology.
The primary path to these goals is to replace PhotoMultipliers (PMTs) with Silicon-PMs (SiPM).