Infrared (IR) thermography utilizes an IR camera. Although IR light is not detectable by the human eye, it is emitted by all objects. The amount of radiation increases with temperature, and is also a function of radiation wavelength, as demonstrated by Planck’s law for an ideal blackbody. IR camera construction is similar to a digital video camera. The main components are lens that focuses the IR light onto the focal plane array (i.e. detector), and electronics and software for processing and displaying the thermal images. From the 2D thermal maps, 3D reconstruction allows us to obtain surface temperature contours of a 3D object.
Reference to figures in a descending order
 Planck’s law and Wien’s displacement law. (2020). Tec-science. Retrieved from https://www.tec-science.com/thermodynamics/temperature/plancks-law-of-blackbody-radiation/
 The ultimate infrared handbook for R&D professionals: A resource guide for using infrared in the research and development industry. (n.d.). FLIR Systems AB. Retrieved from https://www.flirmedia.com/MMC/THG/Brochures/T559243/T559243_EN.pdf
 Rangel, J.C., & Soldan, S. (2014). 3D Thermal Imaging: Fusion of Thermography and Depth Cameras. The 12th International Conference on Quantitative InfraRed Thermography, Bordeaux, France.