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 ?
The new Model 7645 10,000 Volt power supply operates sensitive photomultiplier tubes and related devices for critical photometric and spectroscopy applications.
Yet the detectors, known as photomultiplier tubes, tend to be large, fragile, and power-hungry.
the use of vacuum photodiodes for detector readout reduces the gain sensitivity to magnetic fields as compared to conventional photomultiplier tubes by four orders of magnitude, and the detector gains are essentially independent of bias voltage;
The integration of solid-state detectors into simultaneous ICP systems in place of traditional photomultiplier tubes (PMTs) has shortened the time needed for analyzing a sample and, especially in laboratories like contract-research labs, which in large part measure profits by the number of tests they can conduct, made tests more cost efficient.
About 7,000 or 60% of the 11,000 photomultiplier tubes (PMTs) attached to the neutrino detector in the town of Kamioka in the central Japanese prefecture were found broken last Nov.
As a result of radar detection research during World War II, the development of photomultiplier tubes, which had the capability of taking a few photons of light and generating millions of amplified or stored electrons, led to the development of spectrometers.
In comparison, photomultiplier tubes have O33% output uniformity.
Zecotek is working with major OEMs to prepare for the adoption of its MAPD array as the industry moves toward introducing Time of Flight PET medical scanners as a transition from photomultiplier tubes.
Tenders are invited for Photomultiplier Tubes And Socket Assemblies.
In particular, next-generation CCDs and other types of solid-state detectors are becoming more common in these instruments, even in high-end instruments in which photomultiplier tubes had been standard.
As cells or other fluorescent objects pass through the scanning beam(s), the emitted photons return along the same path as the laser beam(s) and are collected in the wavelength-specific photomultiplier tubes (PMT'S).
The Super-Kamiokande facility, operated by the university's Institute of Cosmic Ray Research, was damaged in November when a chain reaction destroyed most of the photomultiplier tubes installed in the system.