ATIS Telecom Glossary
Saturday, July 26, 2014

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radiometry
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

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
For more information on the work related to these definitions,
please visit the ATIS website and the ATIS Document Center