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 ?
An auxiliary photo-multiplier targets the space situated under the high voltage electrode and at the appearance of the discharge, delivers a pulse which is released with a camera adjustable delay.
Dual supply operation enables gain control of negative-going pulses, such as those generated by photodiodes or photo-multiplier tubes.
With the advent of CZT-based detectors," said Barbara Franciose, Siemens group vice president in charge of world-wide Nuclear Medicine, "nuclear medicine cameras will move past the current paradigm of crystal scintillators and photo-multiplier tubes and enter into a fully-digital arena.
Designed to meet the needs of uncompromising graphic arts professionals in pre-press, digital printing and photographic applications, the HiResolve Sprint uses high-performance photo-multiplier technology to achieve resolutions up to 4,000 dots per inch over the scanner's entire 11.
Each string will have around 30 light detection photo-multipliers distributed along the entire length.