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 ?
Keywords: Polluted insulator; Arc re-ignition condition; Electrolytic surface; Multi-Channel photo-multiplier.
The PMA series ultra-compact PMT high voltage power supply improve upon existing photo-multiplier tube HV supply technology by providing higher output at low ripple in a smaller physical package.
The flashes of light from the sample are then converted into electrical pulses and counted by a photo-multiplier tube.
Once the photo-multiplier tubes freeze in," explains Steven Barwick (University of California), "they love it.
The conventional Raman spectra were acquired on a SPEX Ramalog-91 system consisting of a 1403 double spectrometer, 90| sample-collection optics, and multialkali photo-multiplier tube.
To meet the needs of those manufactures using discrete sensors or photo-multiplier tubes, an option is available to increase the pulse frequency to 200 MHz without affecting system performance.
The COD-based instrument is for analytical performance at the level of Photo-Multiplier Tubes (PMT) spectrometers.