photoelectric cell


photoelectric cell
photocell.
[1890-95]

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also called  Electric Eye, Photocell, or Phototube,  

      an electron tube with a photosensitive cathode that emits electrons when illuminated and an anode for collecting the emitted electrons. Various cathode materials are sensitive to specific spectral regions, such as ultraviolet, infrared, or visible light. The voltage between the anode and cathode causes no current in darkness because no electrons are emitted, but illumination excites electrons that are attracted to the anode, producing current proportional to the intensity of the illumination. These tubes are used in control systems, where interrupting a beam of light opens a circuit, actuating a relay that, in turn, supplies power to a mechanism that brings about the desired operation, such as the opening of a door. The tubes are also used in photometry and in spectroscopy.

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Universalium. 2010.

Look at other dictionaries:

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  • photoelectric cell — ☆ photoelectric cell n. a photodetector that regulates or produces a current or voltage in response to certain types of radiation, esp. visible light: typically incorporated in an electric circuit and used in mechanical devices as to open doors,… …   English World dictionary

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  • photoelectric cell — fotoelementas statusas T sritis automatika atitikmenys: angl. photocell; photoelectric cell; photoelement vok. Fotozelle, f; lichtelektrische Zelle, f; Photoelement, n; Photozelle, f rus. фотоэлемент, m pranc. cellule photo électrique, f; élément …   Automatikos terminų žodynas

  • photoelectric cell — fotoelementas statusas T sritis chemija apibrėžtis Prietaisas, kuris optinės spinduliuotės veikiamas sukuria elektros srovę. atitikmenys: angl. photocell; photoelectric cell rus. фотоэлемент …   Chemijos terminų aiškinamasis žodynas

  • photoelectric cell — fotoelementas statusas T sritis fizika atitikmenys: angl. photocell; photoelectric cell vok. lichtelektrische Zelle, f; Photoelement, n; Photozelle, f rus. фотоэлемент, m pranc. cellule photo électrique, f; photocellule, f; photopile, f …   Fizikos terminų žodynas

  • photoelectric cell — noun a device using a photoelectric effect to generate current …   English new terms dictionary

  • photoelectric cell — /ˌfoʊtoʊəˌlɛktrɪk ˈsɛl/ (say .fohtohuh.lektrik sel) noun a device used for the detection of light. Its operation may depend on the photoelectric effect (def. 1) or the photovoltaic effect. Also, photocell …   Australian English dictionary

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  • photoelectric cell — pho|to|e|lec|tric cell [ ,foutouı,lektrık sel ] noun count 1. ) a piece of equipment that reacts to light and is used in machines such as BURGLAR ALARMS (=machines that make a loud noise if a thief tries to get into a building) 2. ) a piece of… …   Usage of the words and phrases in modern English


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