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 ?
While many technologies have been rapidly moving away from cathode-ray tubes and analog signal processing, nuclear medicine and PET are still predominantly using the analog photomultiplier tube acquisition technologies.
The observation data captured by the Super-Kamiokande facility's photomultiplier tube detectors will be sent to a system installed within the mine consisting of 40 PRIMERGY RX2530 M2 x86 servers and one ETERNUS DX100 S3 storage system, then transmitted to the high-speed distributed file system after undergoing such procedures as noise removal.
[24] Photomultiplier tubes, principles & applications, Photonis, Brive, France, 2002.
The light signals from these scintillations were detected by photomultiplier tubes at the end of these tanks and then fed to oscilloscope.
Its readout method employs very high-frequency electronic circuits, which permit sampling of the signals from the photomultiplier tubes (PMTs) in 8-nanosec periods.
Sensitive photomultiplier tubes line the detector walls, ready to amplify and record the telltale flashes.
According to the agency, there is extremely low likelihood of increasing competitive strain in the mainstay photomultiplier tubes and opto-semiconductor devices, which have market dominance.
It is lined on the top, walls and bottom by 11 129 gigantic blue-sensitive photomultiplier tubes. Outside the main volume is an outer detector with 1 885 tubes that serves to detect and reject any energetic particles that arrive in spite of the massive shielding provided by the mountain.
These devices include photodiodes, photomultiplier tubes, scientific light sources, infrared detectors, photoconductive detectors, and image sensors.
They are suitable for design engineers requiring bias voltage in applications such as avalanche photo diodes and photomultiplier tubes. Output voltages for these new lines range from 0 to 600 through 0 to 1,500 V, at up to 1 W output power, with output current ranges from 300 [micro]A to 1 mA.
This gives equivalent performance to other systems using photomultiplier tubes, and is also smaller and lighter leading to a more economic unit price.
About 7,000 of the 11,000 photomultiplier tubes attached to the neutrino detector operated at the university's research facility in the city of Hida in Gifu Prefecture were found broken in November 2001 due to a chain reaction.