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Abstract
From the identification of thermal energy beyond the visible spectrum by Herschel in 1800 to Robert Wood's pioneering work in infrared photography, little progress to harness this energy for imaging had been made. In this overview of developments in thermal imaging, significant progress has been made especially in the mid- and far-infrared wavelengths. In the last 50 years, electronic detectors have developed to a stage where small hand-held cameras, often similar in appearance to video camcorders, have become a useful tool in a wide range of industries, and medical and veterinary applications where the study of temperature is of special importance. The impact of computer technology in this field is of special benefit.