lämpökatodit
Lämpökatodit, also known as thermionic cathodes, are devices used to emit electrons through the process of thermionic emission. They are a fundamental component in various electronic devices, including vacuum tubes, cathode ray tubes (CRTs), and certain types of electron microscopes. The basic principle behind a lämpökatodi is that when a material is heated to a high temperature, it releases electrons from its surface. This phenomenon is known as the Edison effect, named after Thomas Edison, who first observed it in 1883.
The most common type of lämpökatodi is the indirectly heated cathode, which consists of a filament made
Directly heated cathodes, on the other hand, use the same material for both the filament and the
Lämpökatodit play a crucial role in the operation of vacuum tubes, where they serve as the electron