IR cameras typically consist of an optomechanical component, a focusing/zoom component, an internal non-uniformity correction component, an imaging circuit component, and an infrared detector/refrigerator component. The technical indicators of thermal imaging equipment include NETD, Resolution, FOV, IFOV, Temperature range, and so on. In general, an IR thermography camera converts invisible infrared energy emitted by an object into a visible thermal image. The different colors above the thermal image represent the different temperatures of the object being measured. By viewing the thermal image, the overall temperature distribution of the target can be observed, and the fever condition of the target can be studied to judge the next step.