A typical Knudsen cell contains a crucible (made of pyrolytic boron nitride, quartz, tungsten or graphite), heating filaments (often made of metal tantalum), water cooling system, heat shields, and an orifice shutter.
A standard Knudsen cell comprises a crucible (typically constructed from pyrolytic boron nitride, quartz, tungsten, or graphite), heating filaments (usually fabricated from metal tantalum), a water-cooled system, heat shields, and an orifice shutter.