The infrared thermal imager USES the infrared detector and optical imaging objective lens to accept the infrared radiation energy distribution graph of the measured target and reflect it to the photosensitive element of the infrared detector, so as to obtain the infrared thermal image graph, which corresponds to the thermal distribution field on the surface of the object.Generally speaking, infrared thermal imager is to transform the invisible infrared energy from an object into a visible thermal image.The different colors on the top of the thermal image represent the different temperatures of the object being measured.