Light is a type of electromagnetic wave. Electromagnetic waves with a wavelength of 380nm-780nm appear as a 7-color spectrum visible to the human eye, and electromagnetic waves with a wavelength of 7μm-14μm appear as far infrared rays invisible to the human eye.

Infrared thermal imaging uses polycrystalline silicon, vanadium oxide, etc. as sensors to convert the thermal radiation value of the absorbed far-infrared electromagnetic waves into electrical signals, which are then encoded and decoded into thermal images. Infrared thermal imagers detect the size of the infrared radiation energy of the target object. They are not affected by strong light and can produce clear thermal images even in the darkest night. They are suitable for various application scenarios.