Thermography, commonly referred to as infrared thermography or thermal imaging, is a non-invasive diagnostic procedure that determines and records the heat emitted by an object that may be indicative of a problem in the object. Every object gives off some amount of infrared radiation as it emits heat. The hotter an object is, the more infrared radiation it emits. A thermal camera or detector uses this radiation to create a thermogram – a picture that displays temperature variations in colour or shades of colour.