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 Infrared Theory
History of Infrared
Infrared radiation
was discovered in 1800 by Sir William Herschel while he was measuring the
temperature of the various colors of the visible spectrum separated by a
prism. Herschel observed that the temperature of his
thermometer increased as he moved it from the blue to the red. When he
accidentally placed his thermometer beyond the red region of the visible
spectrum, he noted a further increase in temperature. Herschel called
this invisible light “infrared”, meaning below the red.
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