How do thermal imaging cameras work?

Thermal imaging cameras are specialised infrared cameras that convert this radiation into a colour-coded image to visually represent temperature differences. Thermal imaging cameras work by detecting the infrared radiation emitted by surfaces, which every body above absolute zero emits. A detector converts this radiation into electrical signals, which are then translated by the camera electronics into a colour-coded image that makes temperature differences visible. This allows you to see at a glance which areas are warmer or colder without having to make direct contact.