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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.
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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.
| | == The Thermocouple Gauge == |
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| [[File:iongauge.jpg]] | | [[File:Tc_gauge.png|600px]] |
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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]] | | == The Ion Gauge == |
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| | [[File:Ion_gauge.png|600px]] |
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| | == The Capacitance Gauge == |
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| | [[File:Capacitance_gauge.png|600px]] |
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| | '''Useful Links:''' |
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| | [http://en.wikipedia.org/wiki/Ultra-high_vacuum| UHV - Wikipedia] |
