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An electronic sensing device used to detect weak electromagnetic radiation, typically light, and amplify its energy via the photoelectric effect.


(General Physics) a device sensitive to electromagnetic radiation, consisting of a photocathode, from which electrons are released by incident photons, and an electron multiplier, which amplifies and produces a detectable pulse of current


(ˌfoʊ təˈmʌl təˌplaɪ ər)

a light detector that amplifies a photon's signal by using a photocathode and a series of electrodes to create a cascade of electrons.
References in periodicals archive ?
The BGO and GSO crystals are used in conjunction with photo-multiplier tubes which are purchased separately.
The present paper comprises an experimental investigation into the prediction of the critical flashover voltage of polluted insulators energized with AC voltage using a multi-channel photo-multiplier (MCP) and high speed camera to observe the behavior of ac arc on electrolytic surface.
The voltage of the photo-multiplier tube (PMT) for the fluorescence channel was kept the same for the cell measurements as for MESF microbead measurements in both instruments.
Totsuka says this experiment can be restarted, perhaps within a year, using only about half of Super-Kamiokande's full complement of photo-multiplier tubes.