PMTs

Discussion in 'General Electronics Chat' started by Mazaag, Feb 26, 2009.

  1. Mazaag

    Thread Starter Senior Member

    Oct 23, 2004
    255
    0
    Hey Guys,

    Quick question about Photomultiplier Tubes.

    Do PMTs spatially and/or spectrally resolve an optical signal? or does it just work as a "photon counter" ?

    Thanks guys.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    Here is the Photo multiplier handbook from hamamatsu.(PDF)

    Greetings,
    Bertus
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    With the correct formulation on the photocathode, PMT's can be made to preferentially respond to selected light frequencies. But photoelectric effect is photoelectric effect.

    An array of them can do spacial resolution. There are a couple of large arrays operating underground to detect neutrons.

    Spectral resolution is usually done in signal processing. Photons carrying different energies produce output with characteristic pulse heights. A pulse height analyzer can be set to pass only pulses with specified heights and so only count events produced by specific frequencies.
     
  4. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,039
    287

    A single PMT is just a photon counter. ARRAYS of PMT's can do all the other things you suggest.

    eric
     
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