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Radiometry
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{{Short description|Techniques for measuring electromagnetic radiation}} {{one source|date=December 2015}} [[File:photometry_radiometry_units.svg|thumb|upright=1.5|Comparison of photometric and radiometric quantities]] '''Radiometry''' is a set of techniques for [[measurement|measuring]] [[electromagnetic radiation]], including [[visible light]]. Radiometric techniques in [[optics]] characterize the distribution of the radiation's [[power (physics)|power]] in space, as opposed to [[photometry (optics)|photometric]] techniques, which characterize the light's interaction with the human eye. The fundamental difference between radiometry and photometry is that radiometry gives the entire optical radiation spectrum, while photometry is limited to the visible spectrum. Radiometry is distinct from [[quantum optics|quantum]] techniques such as [[photon]] counting. The use of [[radiometer]]s to determine the temperature of objects and gasses by measuring radiation flux is called [[pyrometry]]. Handheld pyrometer devices are often marketed as [[infrared thermometer]]s. Radiometry is important in [[astronomy]], especially [[radio astronomy]], and plays a significant role in [[Earth remote sensing]]. The measurement techniques categorized as ''radiometry'' in optics are called [[Photometry (astronomy)|''photometry'']] in some astronomical applications, contrary to the optics usage of the term. '''Spectroradiometry''' is the measurement of absolute radiometric quantities in narrow bands of wavelength.<ref>{{cite book|title=Focal Encyclopedia of Photography|publisher=[[Focal Press]] | author=Leslie D. Stroebel | author2=Richard D. Zakia | name-list-style=amp | date=1993 | edition=3rd|page=[https://archive.org/details/focalencyclopedi00lesl/page/115 115] |isbn=0-240-51417-3 | url = https://archive.org/details/focalencyclopedi00lesl |url-access=registration|quote=spectroradiometry Focal Encyclopedia of Photography.}}</ref>
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