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  • 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...
  • dark current The current that flows in a photodetector when there is no optical radiation incident on the detector and operating voltages are applied.
  • dark noise The noise produced in a photodetector when the photocathode is shielded from all external optical radiation and operating voltages are applied.
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