measurement of the strength of radiant energy with a radiometer
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Radiometry Definition from Language, Idioms & Slang Dictionaries & Glossaries
radiometry
\ra`di*om"e*try\ (?), n. (physics) the use of the radiometer, or the measurement of radiation. -- ra`di*o*met"ric (#), a.
Radiometry Definition from Science & Technology Dictionaries & Glossaries
The science of radiation measurement. See 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 Definition from Encyclopedia Dictionaries & Glossaries
In optics, radiometry is a set of techniques for measuring electromagnetic radiation, including visible light. Radiometric techniques 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. Radiometry is distinct from quantum techniques such as photon counting.
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