Thermal camera utilizes infrared radiations

A REVOLUTIONARY new technique for taking “heat pictures” was unveiled by Dr. R. B. Barnes called the Far Infrared Camera to take heat pictures, or thermal photographs, by photographing the infrared radiation or heat given off by objects. Heat pictures differ from conventional photographs which use the visible light reflected by all objects. The camera detects the infrared radiation and converts it into black-and-white photographs. Each point on the photographic image indicates the heat being emitted by that point and can be converted into temperature readings.