Thermal lmager is a kind of device which uses thermal imaging technology to take thetemperature and observe the heat distribution on the surface of natural objects.Any natural object will radiate infrared radiation to its surroundings.Thermal imaging technology refers to the use of optical imaging objective lens and infrared detector to receive the infrared radiation energy of the measured target and reflect it to the photo sensitive element of the infrared detector, so as to obtain a circular figure of the thermal distribution on the surface of the object.This thermal image corresponds to the thermal distribution field on the surface of the object. Generally speaking, infrared thermal imaging is to transform the invisible infrared energy emitted by an object into a visible thermal image, that is, the image oftemperature distribution on the target surface.