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Tungsten Filament
Tungsten Filament is arguably the key component of the
incandescent lamp business.
The tungsten filament of a vacuum incandescent lamp is
heated to temperatures where visible light is emitted by
resistance heating. The filament acts as an electrical
resistor, which dissipates power proportional to the voltage
applied, times the current through the filament. When that
power level is sufficient to raise the temperature to above
1000 degrees Kelvin, visible light is produced.
The Tungsten Filament is quite sturdy and provides stable
and uniform electron emission, primarily used in scanning
electron microscopy. Custom
tungsten filament cathodes in a variety of filament sizes
and configurations and a variety of glass or ceramic bases
are available. Some combinations of various options may not
be possible due to design considerations. All tungsten
cathodes are shipped pre-fired, vacuum clean, and ready to
install.
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