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Radiometry 𓆩⚪𓆪｜Definition｜1st｜20260324145329-00-⌔
Radiometry
Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light. Radiometric techniques in optics characterize the distribution of the radiation’s power in space, as opposed to photometric techniques, which characterize the light’s interaction with the human eye.
The fundamental difference between radiometry and photometry is that radiometry can cover the entire optical radiation spectrum,1 while photometry is limited to the visible spectrum.2 However, some definitions of radiometry include other portions of the electromagnetic radiation spectrum,34 and some glossaries define photometry such that associated quantities are weighted by wavelength according to the spectral sensitivity of the human visual system.5 Photometry can therefore be considered a kind of radiometry.6 Radiometry is distinct from quantum techniques such as photon counting.
The use of radiometers to determine the temperature of objects and gasses by measuring radiation flux is called pyrometry. Handheld pyrometer devices are often marketed as infrared thermometers.
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 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.7
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Link to original Footnotes
CIE (2020). e-ILV, online version of CIE S 017:2020, International Lighting Vocabulary (2 ed.). Vienna: International Commission on Illumination. §17-25-005, radiometry. Retrieved 7 Dec 2025. ↩
IES (2022). ANSI/IES LS-1-22, Lighting Science: Nomenclature And Definitions For Illuminating Engineering. New York: Illuminating Engineering Society. §8.4, photometry. Retrieved 7 Dec 2025. ↩
IES (2022). ANSI/IES LS-1-22, Lighting Science: Nomenclature And Definitions For Illuminating Engineering. New York: Illuminating Engineering Society. §8.3, radiometry. Retrieved 7 Dec 2025. ↩
IUPAC (2019). IUPAC Recommendations: Compendium of Chemical Terminology (Gold Book) (2 ed.). Research Triangle Park, NC: International Union of Pure and Applied Chemistry. §R05115, radiometry. doi:10.1351/goldbook. Retrieved 7 Dec 2025. ↩
CIE (2020). e-ILV, online version of CIE S 017:2020, International Lighting Vocabulary (2 ed.). Vienna: International Commission on Illumination. §17-25-013, photometry. Retrieved 7 Dec 2025. ↩
DiLaura, David L.; Houser, Kevin W.; Mistrick, Richard G.; Steffy, Gary R. (2011). The Lighting Handbook: Reference and Application (10 ed.). New York: Illuminating Engineering Society. p. 9.1. ISBN 978-087995-241-9. OCLC 739932332. ↩
Leslie D. Stroebel & Richard D. Zakia (1993). Focal Encyclopedia of Photography (3rd ed.). Focal Press. p. 115. ISBN 0-240-51417-3. spectroradiometry Focal Encyclopedia of Photography. ↩
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