photocathode image

См. также в других словарях:

• Photocathode — In a photomultiplier or Phototube, a photocathode is a negatively charged electrode coated with a photosensitive compound. When this is struck by light, electrons are emitted due to the photoelectric effect.Although a plain metallic cathode will… …   Wikipedia

• image orthicon — noun a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons (Freq. 1) •… …   Useful english dictionary

• image orthicon — Television. a camera tube, more sensitive than the orthicon, in which an electron image generated by a photocathode is focused on one side of a target that is scanned on its other side by a beam of low velocity electrons to produce the output… …   Universalium

• X-ray image intensifier — An X ray image intensifier (XRII), sometimes referred to as a C Arm or Fluoroscope in medical settings, is a highly complex piece of equipment which uses x rays and produces a live image feed which is displayed on a TV screen.The term image… …   Wikipedia

• TUBES ÉLECTRONIQUES — Les tubes électroniques sont des composants qui entrent dans la constitution de matériels électroniques très divers (émetteurs de radiodiffusion; émetteurs, récepteurs, caméras de télévision; équipements de télécommunications; radars; contre… …   Encyclopédie Universelle

• Video camera tube — In older video cameras, before the mid to late 1980s, a video camera tube or pickup tube was used instead of a charge coupled device (CCD) for converting an optical image into an electrical signal. Several types were in use from the 1930s to the… …   Wikipedia

• Charge-coupled device — A specially developed CCD used for ultraviolet imaging in a wire bonded package. A charge coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for… …   Wikipedia

• Night vision device — A U.S. Army aviator uses a pair of helmet mounted AN/AVS 6 vision goggles. A German Army …   Wikipedia

• PHOTOÉLECTRIQUE (EFFET) — On désigne sous le nom d’effet photoélectrique tous les phénomènes électriques qui sont provoqués par l’action de la lumière sur la matière. L’absorption de lumière par un solide peut entraîner l’éjection d’électrons dans le vide ou dans le… …   Encyclopédie Universelle

• Intensified charge-coupled device — An intensified charge coupled device (ICCD) is a CCD that is optically connected to an image intensifier, that is mounted in front of the CCD. An image intensifier includes three functional elements: a photocathode, a micro channel plate (MCP)… …   Wikipedia

• radiation measurement — ▪ technology Introduction       technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement.       The term ionizing radiation refers to those… …   Universalium