Radiometry

n. measurement of the strength of radiant energy with a radiometer

In optics, radiometry is the field that studies the measurement of electromagnetic radiation, including visible light. Note that light is also measured using the techniques of photometry, which deal with brightness as perceived by the human eye, rather than absolute power.Radiometry is important in astronomy, especially radio astronomy, and is important for 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.
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Radiometer /ra·di·om·e·ter/ an instrument for detecting and measuring radiant energy. ra·di·om·e·ter n. 1. [more]Radiometry - Community and Resources

The science of radiation measurement. See Table of Radiometric Terms. TABLE OF RADIOMETRIC TERMS Term Symbol Quantity Unit radiant energy Q energy joule (J) radiant power Synonym optical power power watt (W) irradiance E power incident per unit area (irrespective of angle) W•m-2 spectral irradiance E irradiance per unit wavelength interval at a given wavelength W•m-2•nm-1 radiant emittance Synonym radiant exitance W power emitted (into a full sphere) per unit area W•m-2 radiant intensity I power per unit solid angle W•sr-1 radiance L power per unit angle per unit projected area W•sr-1•m-2 spectral radiance L radiance per unit wavelength interval at a given wavelength W•sr-1•m-2•nm-1

radiometry
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