Cañón de electrones Índice Partes Véase también Fuentes Nota Menú de navegación

Válvulas termoiónicas


tubo de imagenmicroscopio electrónico






CRT: cañón de electrones monocromático




CRT: cañón de electrones de un osciloscopio


Un cañón de electrones es el elemento que sirve para generar y dirigir un haz de electrones adecuadamente y con energía suficiente. El cañón de electrones es parte fundamental de un tubo de imagen, de un microscopio electrónico, y la fuente de electrones.




Índice





  • 1 Partes


  • 2 Véase también


  • 3 Fuentes


  • 4 Nota




Partes


El cañón de electrones consta de los siguientes elementos (G1-G2-G3-G4, bautizados tanto rejas como ánodos ):



  • Cátodo - calentado indirectamente mediante un filamento espiral, que lo hace emitir electrones por termoemisión.


  • G1 (Reja de control o Wehnelt) - es un pequeño cilindro con un orificio, el cilindro rodea cátodo y tiene una relación potencial negativo respecto a él, la diferencia de potencial permite modular la intensidad del haz de electrones, y por tanto el brillo del punto luminoso de un tubo de rayos catódicos.


  • G2 (Reja pantalla o Ánodo acelerador) - consta de un electrodo cilíndrico de más diámetro que el G1, acelera el haz de electrones.


  • G3 (Ánodo de enfoque) - permite enfocar el haz y que impacte en un área muy pequeña de la pantalla. Es generalmente un cilindro hueco y suele estar conectado a una fuente elevada de tensión variable que sirve para enfocar. El sistema de enfoque es equivalente a las lentes en los sistemas ópticos.


  • G4 (Ánodo de astigmatismo-no siempre está) - consta de un electrodo cilíndrico de diferente diámetro que los anteriores, sirve corregir el astigmatismo.


Véase también


  • Emisión (física)

  • Tubo de electrones

  • Cátodo frío

  • Efecto fotoeléctrico

  • Emisión por efecto de campo

  • Emisión termoiónica

  • Microscopio de iones de Helio


Fuentes


  • Jerzy Antoniewicz (editores), Instrucciones Radio y Teleelektryka. B - Elementos y componentes de , PWT, Varsovia 1959


Nota








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