Difference between revisions of "Pressure Sensor Technologies"

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Intro: Pressure sensing technology that we use in the lab mostly revolves around ionic and thermal applications of gas properties. Ion and thermal couple gauges respectively.
 
Intro: Pressure sensing technology that we use in the lab mostly revolves around ionic and thermal applications of gas properties. Ion and thermal couple gauges respectively.
  
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Ion Gauges: A filament is charged and produces free electrons. These electrons roam free in the low pressure system until they bombard a gas atom. This bombardment knocks off an electron from the gas atom, creating a cation. This cation is attracted to a collector which completes a circuit between the filament and the collector. This current is measured and is directly related to the density of the remaining gas and subsequently, its pressure.
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Ion Gauge:  
  
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[[File:iongauge.jpg]]
 
  
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Thermocouple Gauge (TCG): A heated filament is placed into the low pressure system and allowed to cool. The rate of heat loss is directly related to gas density and subsequently, pressure.
 
  
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[[File:TCG.gif]]
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Thermocouple Gauge (TCG): A heated filament is placed into the low pressure system. The rate of heat transfer is directly related to gas density and subsequently, pressure.
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[[File:TCG.gif|250px]]

Revision as of 13:52, 15 June 2014

Intro: Pressure sensing technology that we use in the lab mostly revolves around ionic and thermal applications of gas properties. Ion and thermal couple gauges respectively.

Ion Gauge:


Thermocouple Gauge (TCG): A heated filament is placed into the low pressure system. The rate of heat transfer is directly related to gas density and subsequently, pressure.

TCG.gif

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