What is a thermal imager and how do thermal imagers work?

Thermal imagers are imaging devices that detect emitted infrared wavelengths. Simply put, all objects that are above absolute 0º constitute molecular movement. This molecular movement produces energy or “heat”.

The heat is emitted not in the visible spectrum but in the infrared spectrum, which is invisible to the human eye. Thermal imagers detect this emitted infrared energy and process the information electronically into a video or “visual” image so that we can “see” the emitted energy. Thermal imagers allow us to see objects in total darkness, see heat signatures left by hand or foot prints and many other scenarios that we would not be able to normally “see” in the visual world.

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