Spectral tube
The spectral tube is a form of the electron tube . It was invented by the physicist William Crookes .
Structure / function
The Spectrum consists essentially of an aluminum - cathode and an anode in the form of plate. Both components are located in a partially evacuated glass tube that is filled with gases , vapors or aerosols and can have different shapes.
The operating voltage of this type of electron tube is around 1 to 7 kV.
Designs
There are various designs, in the past they were mostly H-shaped, now I-shaped are more common.
Examples of fillers
Gases
H hydrogen , high purity
O oxygen
N nitrogen
Hey helium
Ne neon
Ar argon
Kr krypton
Xe xenon
Air as a mixture of nitrogen and oxygen
Aerosols and vapors
Because the different fillers have different emission lines , they are well suited for viewing through an optical grating .
literature
- Wilhelm von Zahn : Spectral tubes with a longitudinal view. In: Annalen der Physik 244 (1879), p. 675.
Web links
- Examples of spectral tubes
- Instructions for use (PDF; 279 kB)