Since infrared or heat radiation of wavelength longer than about one micron cannot be detected by visual or photographic means, physicists, besides pushing development of standard radiation detectors such as thermopiles and bolometers, have roamed far afield in their attempts to find new and more sensitive infrared detectors.
Nelson Fuson; Infrared Detector. Physics Today 1 November 1948; 1 (7): 27. https://doi.org/10.1063/1.3066196
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