cathode spot

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• cathode spot — noun 1. : a small area of the anticathode of an X ray tube upon which the cathode rays are focused and from which proceed the X rays 2. : a small area on the mercury cathode of a mercury arc rectifier where the arc strikes it and liberates… …   Useful english dictionary

• cathode-ray tube — n a vacuum tube in which a beam of electrons is projected on a fluorescent screen to produce a luminous spot * * * a vacuum tube in which the cathode rays are accelerated as a beam to form luminous spots on a fluorescent screen …   Medical dictionary

• Cathode ray tube — Cutaway rendering of a color CRT: 1. Three Electron guns (for red, green, and blue phosphor dots) 2. Electron beams 3. Focusing coils 4. Deflection coils 5. Anode connection 6. Mask for separating beams for red,… …   Wikipedia

• cathode-ray tube — /kath ohd ray / a vacuum tube generating a focused beam of electrons that can be deflected by electric fields, magnetic fields, or both. The terminus of the beam is visible as a spot or line of luminescence caused by its impinging on a sensitized …   Universalium

• cathode-ray tube — /ˌkæθoʊd reɪ ˈtjub/ (say .kathohd ray tyoohb) noun Electronics a vacuum tube in which is generated a focused beam of electrons which can be deflected by electric and/or magnetic fields. The terminus of the beam is visible as a spot or line of… …  

• spot size — The size of the electron spot on the face of the cathode ray tube …   Military dictionary

• cathode-ray tube — noun Date: 1905 a vacuum tube in which a beam of electrons is projected on a phosphor coated screen to produce a luminous spot at a point on the screen determined by the effect on the electron beam of a variable magnetic field within the tube …   New Collegiate Dictionary

• cathode-ray tube — cath′ode ray tube n. elo elm a vacuum tube generating a focused beam of electrons, the terminus of which is visible as a luminescent spot or line on a screen at the broad end of the tube: used to display images on a television receiver or… …   From formal English to slang

• Flying-spot scanner — A flying spot scanner (FSS) uses a scanning source of a spot of light, such as a high resolution, high light output, low persistence Cathode Ray Tube (CRT), to scan an image, usually from motion picture film or a slide. The output of the scanner… …   Wikipedia

• focal spot size — The measured size of a focal spot of an x ray tube, a function of the actual size of the cathode and the angulation of the anode surface. See focal spot …   Medical dictionary

• flying spot — A rapidly moving spot of light, usually generated by a cathode ray tube and used to scan a surface containing visual information …   Aviation dictionary