Photonics Buyers' Guide > Photomultiplier Tubes

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Photomultiplier Tubes A photomultiplier tube is a tube consisting of an evacuated envelope with a photocathode that emits electrons when exposed to light. These electrons are accelerated by a positive electrostatic field and fall upon a metal surface where they emit secondary electrons that are again accelerated to generate more electrons at the next metal surface, and so on. The whole arrangement thus acts as a combination of a simple photocell with a high-gain amplifier in a self-contained unit.
ADDITIONAL COMPANIES

  • TERMS
  • photomultiplier tube (PMT) A tube consisting of an evacuated envelope with a photocathode that emits electrons when exposed to light. These electrons are accelerated by a positive electrostatic field and fall upon a metal surface where they emit secondary electrons that are...
  • photocathode An electrode used to release photoelectric emission when irradiated, making it then the irradiated negative electrode of a phototube.
  • phototube An electron tube having a photocathode for the emission of a photoelectric current.
  • photocell



   

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