This device allows you to see in total darkness utilizing temperature and converting it to video. In terms of performance, a FLIR allows users to both see and measure subtle changes in temperature. The sensors installed in FLIR cameras, as well as those of other thermal imaging cameras, use detection of infrared radiation, typically emitted from a heat source (thermal radiation) to create an image assembled for video output. The wavelength of infrared that thermal imaging cameras detect differs significantly from that of night vision, which operates in the visible light and near-infrared ranges.
Many camera systems use digital image processing to improve the image quality. Infrared imaging sensor arrays often have wildly inconsistent sensitivities from pixel to pixel due to limitations. The FLIR is a non-contact device that detects infrared energy (eat) and converts it into an electronic signal, which is then processed to produce a thermal image or video, on which you can perform temperature calculations.