Because of their inherent small size, in the past it was only possible to measure the temperature of filaments using filament pyrometers or modern intensity-comparison pyrometers. These methods require the user to view the colour or intensity of a calibrated reference wire and match the colour of this wire to that of the target ...
Filament temperature can be an important indicator of process performance and effectiveness, whether to determine the filaments’ radiation properties and degree of deterioration or to control the heating process.