photoelectric counter A device that registers a count whenever an object breaks the light beam shining on its phototube or photocell. An amplifier then boosts the minute energy to register on a mechanical or other type of counter. Slow counting rates can be recorded by a mechanical counter, but high rates require an electronic counter.
photoelectric current The stream of electrons emitted by a phototube when the cathode is exposed to light.
photoelectric cutoff control A photorelay circuit used in machines for cutting long strips of paper, cloth, metal, or other material accurately into predetermined lengths or at predetermined positions.
photoelectric effect 1. The transfer of energy from incident radiation to electrons in a substance. This ...
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