Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. These detectors multiply the current produced by incident light by as much as 10...
a photosensitive vacuum tube comprising a photoemissive cathode and an electron multiplierphotoelectric detector comprising a photocathode, an anode and an electron multiplication device that uses the secondary emission of dynodes or channels between photocathode and anode