Passive Thermography, Thermal Imaging
Thermography is an imaging technique designed to use the thermal radiation of an object to determine its characteristics. The surface radiation of an object is measured. With the use of Planck’s Radiation Law and knowing the emissivity, it is possible to calculate the surface temperature.
The emissivity of real bodies is explained on the basis of the physical laws governing the emission of radiation. The infrared radiation sensors required for the detection are presented below. These are divided into thermal sensors and photon sensors. Thermal sensors detect the radiation energy, while photon sensors record the photon flux. The structure and functionality of thermal imaging cameras are set out. Finally, thermographic techniques for preventive maintenance, testing electronic components, and process monitoring are presented.
- Rogalski A (1995) Infrared photon detectors. SPIE Press, BellinghamGoogle Scholar