photomultiplier

(redirected from PM tube)
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Related to PM tube: Photomultiplier Tube

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 ?
usually too bulky to embed into this frame, making designers have to choose between amplifier and PM tube; Karunanidhi and Singaperumal developed two flapper-nozzle servo valves; the first one employs mechanical amplifier and the second one uses tube-like PM, and the bidirectional stroke of the mechanical amplified one could only be realized using DC bias [3]; moreover, for servo valves demanding high reliability, they tend to employ redundant structures in their electromechanical transducers [16]; when the redundant actuators are parallelly located, their radius size should be limited and there will be little space for tube-like PMs.