Thermal IP Cameras
Thermal IP Cameras utilize a portion of the electromagnetic spectrum not visible to the human eye. By detecting radiation in the infrared range of the electromagnetic spectrum, thermal cameras can produce images of called thermograms. The basic principle is that objects with higher temperature emit higher levels of infrared radiation. With a camera that can detect infrared radiation, you can visibly see the difference between a warm human body walking through a pitch black area where the surroundings are a different temperature. The limitation of thermal cameras is that the output is an image of objects radiating heat. It will not display objects as you see them with a human eye, only highlight the areas of objects whose heat signatures vary from its surroundings.
Todays thermal devices have been so well refined that the slightest differences in temperature can be detected therefore allowing easier identification of the objects in view. It was not until 2010 that Axis Comminications introduced the first Network Based Thermal Camera, and at the same time reasonable prices for the this technology. With this introduction, Axis has changed the Thermal Camera market. There are a few important factors to consider when purchasing an IP Thermal Camera. First is the myth that thermal cameras can see through walls. This is false. In fact all thermal cameras have difficulty even seeing through glass. The glass lenses of Axis Thermal Cameras and outdoor housings are scientifically engineered for this reason. Secondly, Thermal Cameras that perform better than 8.33 frames per second at D1 resolution may only be exported top certian countries outside of the United States. Thermal cameras with a frame rate above 9 per second are subject to export control regulations. Lastly, Network Thermal Cameras are designed for detection rather than recognition. These are best suited to supplement traditional Network Cameras that cannot perform in exetremely low to no light areas.