His initial discovery was further developed by many other physicists, engineers and inventors in subsequent years: Today, we refer to this invisible band as ‘infrared’ radiation, which lies between visible light and microwave frequencies on the electromagnetic spectrumĪlthough thermal imaging camcorders were still a long way off, Herschel’s findings were quickly used to produce a number of early thermocouple-type modules, which could detect the unseen heat emanating from warm bodies at a considerable distance.Herschel found he could place a thermometer just beyond the red light end of the spectrum to detect the existence of a hitherto unknown invisible band, warmer than any of those in visible light.In simplified terms, Herschel was the first to discover the presence of infrared, all the way back in February 1800, while using a prism to study the visible light spectrum.However, viewing heat energy as an infrared spectrum display isn’t actually a new concept by any means in fact, the roots of the basic thermography principle were established more than 200 years ago by the German-British astronomer William Herschel: It’s only in the past few years that the mass production of thermal imaging technologies has reached a point where handheld thermographic cameras (also known as heat cameras, thermal detection or infrared cameras) are now an accessible option for most civil applications and/or hobbyist use.
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