The thermal radiation of objects is found behind the visible red spectrum of light.
This range is called the infrared wavelength range.
The camera consists of a lens, a spectral filter, the detector (sensor) and appropriate electronics for amplification, linearization and corresponding signal processing.
Infrared cameras are used in many areas, because they allow the measurement of difficult to access or moving objects with short measurement and response times.
During the measurement there is no influence on the object to be measured.
In the field of plastics technology, infrared cameras are used, for example, for testing and monitoring the injection molding process.