FLIR Systems is the world leader in the design , manufacturing and marketing of thermal imaging systems for a wide variety of commercial , industrial and government applications. FLIR Systems thermal imaging systems use state-of-the-art infrared imaging technology that detects infrared radiation – or heat. Based on detected temperature differences , thermal imaging cameras can create a crisp image. Complicated algorithms make it also possible to read correct temperature values from this image. FLIR designs and manufactures all the critical technologies inside their products , including detectors , electronics , and special lenses themselves.