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8 terms
Photonics Dictionary: P
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phototube x
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phototube
An electron tube having a photocathode for the emission of a photoelectric current.
photoelectric tube
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phototube
An electron tube having a photocathode for the emission of a photoelectric current.
phototube relay
A photoelectrical relay that uses a phototube as its photoelectric device to open and close an electrical relay; used to activate counters and safety controls.
photoelectric multiplier
A phototube in which the primary photoemission current, before being extracted at the anode, is multiplied many times.
photoelectric current
The electron stream emitted by a phototube when the cathode is exposed to light.
photoelectric photometer
Also known as electronic photometer. A photometer with a photocell, phototransistor or phototube for measuring the intensity of light.
photoelectric scanner
A system mounted a few inches above a moving plane that consists of a light source, lenses and one or more phototubes. In this position, the scanner actuates the control equipment when the quantity...
photoglow tube
A particular type of phototube having increased sensitivity as a result of the glow initiated by light incident to the cathode.
Photonics Dictionary
P
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