Infrared thermography is a technique of recording the temperature of objects and materials using infrared rays.
Les caméras infrarouges enregistrent la température des surfaces auscultées en différents points. Elles reproduisent ces mesures en une image couleur appelée thermogramme.
This image reports the temperatures recorded according to a color code. Cold spots are represented by a gradation of cold colors: green, blue, purple, up to black, which represents the coldest temperature. In contrast, the higher the temperature on the surface of an element, the warmer its representation, starting from yellow to orange, red and then white.
The observation of hotter or colder surface points can betray an anomaly. For example, a portion of bluish wall on a thermogram captured from the inside, in winter, could denounce the absence of thermal insulation. In such a case, the same wall section subjected to the infrared camera from the outside would then appear in warm colors due to the heat loss.