hot cathode वाक्य
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- The principal use of lanthanum hexaboride is in hot cathodes, either as a single crystal or as a coating deposited by physical vapor deposition.
- As described in July 1941, the Beckman spectrophotomter could use a " hot cathode hydrogen discharge tube " or a tungsten light source interchangeably.
- The hot cathode can be a metal filament, a coated metal filament, or a separate structure of metal or carbides or borides of transition metals.
- These cold cathode type X-ray tubes were used until about 1920, when they were superseded by the hot cathode Coolidge X-ray tube.
- A hot cathode is at an advantage, as ionization of the gas is made easier; thus, the tube's control electrode is more sensitive.
- Electrical filaments are also used in hot cathodes of fluorescent lamps and vacuum tubes as a source of electrons or in vacuum tubes to heat an electron-emitting electrode.
- A duoplasmatron is a type of glow discharge ion source that consists of a hot cathode or cold cathode that produces a plasma that is used to ionize a gas.
- Today, hot cathodes are used as the source of electrons in fluorescent lamps, vacuum tubes, and electron guns in cathode ray tubes and laboratory equipment such as electron microscopes.
- X-rays can be generated by an X-ray tube, a vacuum tube that uses a high voltage to accelerate the electrons released by a hot cathode to a high velocity.
- In vacuum tubes, a "'hot cathode "'or "'thermionic cathode "'is a cathode electrode which is heated to make it emit electrons due to thermionic emission.
- The Wehnelt is biased to a negative voltage ( typically " 200V to " 300V ) relative to the emitter, which is usually a tungsten filament or Lanthanum hexaboride ( LaB 6 ) hot cathode.
- The first cathode ray tube to use a hot cathode was developed by John B . Johnson ( who gave his name to the term Johnson noise ) and Harry Weiner Weinhart of Western Electric, and became a commercial product in 1922.
- The classical example of thermionic emission is the emission of electrons from a hot cathode into a vacuum ( also known as "'thermal electron emission "'or the "'Edison effect "') in a vacuum tube.
- For decades, electron-tube designers tried to augment amplifying tubes with electron multipliers in order to increase gain, but these suffered from short life because the material used for the dynodes " poisoned " the tube's hot cathode . ( For instance, the interesting RCA 1630 secondary-emission tube was marketed, but did not last . ) However, eventually, Philips of the Netherlands developed the EFP60 tube that had a satisfactory lifetime, and was used in at least one product, a laboratory pulse generator.
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