photomultiplier tube

photomultiplier tube

      electron multiplier tube that utilizes the multiplication of electrons by secondary emission to measure low light intensities. It is useful in television camera tubes, in astronomy to measure intensity of faint stars, and in nuclear studies to detect and measure minute flashes of light. The tube utilizes a photosensitive cathode, that is, a cathode that emits electrons when light strikes it, followed by a series of additional electrodes, or dynodes, each at a successively higher positive potential so that it will attract electrons given off by the previous dynode.

      The first dynode is made to emit several electrons by each electron striking it; similarly, each electron from the first dynode causes the second dynode to emit several electrons, leading to an increase, or multiplication, of electrons at each dynode until the final dynode is reached. Total amplification may reach 1,000,000, with nine dynodes customarily employed.

* * *


Universalium. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • photomultiplier tube — fotodaugintuvas statusas T sritis automatika atitikmenys: angl. photomultiplier; photomultiplier tube vok. Photoelektronenvervielfacher, m; Photomultiplikatorröhre, f rus. фотоумножитель, m; фотоэлектронный умножитель, m pranc. tube… …   Automatikos terminų žodynas

  • photomultiplier tube — fotodaugintuvas statusas T sritis radioelektronika atitikmenys: angl. photomultiplier; photomultiplier tube vok. Photoelektronenvervielfacher, m; Photomultiplikatorröhre, f; Photovervielfacher, m rus. фотоумножитель, m; фотоэлектронный умножитель …   Radioelektronikos terminų žodynas

  • photomultiplier tube — noun see photomultiplier * * * pho|to|mul|ti|pli|er «FOH toh MUHL tuh PLY uhr», noun. or photomultiplier tube, a vacuum tube having a series of supplementary electrodes between the photocathode and the anode. When light strikes the photoemissive… …   Useful english dictionary

  • photomultiplier tube — pho·to·mul·ti·pli·er tube .fōt ō məl tə .plī( ə)r n a vacuum tube that detects light esp. from dim sources through the use of photoemission and successive instances of secondary emission to produce enough electrons to generate a useful current… …   Medical dictionary

  • photomultiplier tube — noun Date: 1941 a vacuum tube that detects light especially from dim sources through the use of photoemission and successive instances of secondary emission to produce enough electrons to generate a useful current called also photomultiplier …   New Collegiate Dictionary

  • PhotoMultiplier Tube — Photomultiplicateur Pour les articles homonymes, voir PM. Le photomultiplicateur (PM) est un dispositif permettant la détection de photons. Il se présente sous la forme d un tube électronique. Sous l’action de la lumière, des électrons sont… …   Wikipédia en Français

  • photomultiplier tube — an electronic device that magnifies the light emitted from a scintillator by accelerating electrons in a high voltage field. The resulting signal can be used to display the scintillations on a TV screen. Such devices are commonly used in gamma… …   The new mediacal dictionary

  • Photomultiplier — Schematische Skizze eines Photomultipliers Photomultiplier, Länge …   Deutsch Wikipedia

  • photomultiplier — fotodaugintuvas statusas T sritis automatika atitikmenys: angl. photomultiplier; photomultiplier tube vok. Photoelektronenvervielfacher, m; Photomultiplikatorröhre, f rus. фотоумножитель, m; фотоэлектронный умножитель, m pranc. tube… …   Automatikos terminų žodynas

  • photomultiplier — fotodaugintuvas statusas T sritis radioelektronika atitikmenys: angl. photomultiplier; photomultiplier tube vok. Photoelektronenvervielfacher, m; Photomultiplikatorröhre, f; Photovervielfacher, m rus. фотоумножитель, m; фотоэлектронный умножитель …   Radioelektronikos terminų žodynas

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”