cathode spot

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 electrons

Useful english dictionary. 2012.

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  • 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

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  • 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

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  • 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

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