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| {{redirect|Radiation intensity|ionizing radiation|Radiation flux|other measures of electromagnetic radiation|Light intensity (disambiguation)}}
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| <!--Do NOT redirect this page to "Intensity". Radiant intensity is a different quantity, with different units!-->
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| In [[radiometry]], '''radiant intensity''' is a measure of the intensity<!--DO NOT LINK: general use of term--> of [[electromagnetic radiation]]. It is defined as [[power (physics)|power]] per unit [[solid angle]]. The [[SI]] unit of radiant intensity is [[watt]]s per [[steradian]] (W·sr<sup>−1</sup>). Radiant intensity is distinct from [[irradiance]] and [[radiant exitance]], which are often called ''[[intensity (physics)|intensity]]'' in branches of physics other than radiometry. In [[RF engineering]], radiant intensity is sometimes called '''radiation intensity'''.
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| ==RF engineering==
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| Radiant intensity is used to characterize the emission of radiation by an [[Antenna (radio)|antenna]].<ref>{{cite book |title=Antennas for all applications |edition=3rd |first1=John |last1=de Kraus |first2=Ronald J. |last2=Marhefka |year=2002 |isbn=0-07-232103-2}}</ref> Given an antenna's [[irradiance|power density]] <math>S_r</math> (watts per square meter), at some distance <math>r</math> from the antenna, radiation intensity is calculated by multiplying by the square of the distance:
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| :<math>U = S_r \cdot r^2</math>
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| The radiation intensity is expressed in watts per unit solid angle (watts per steradian). Unlike power density, radiation intensity does not depend on distance: because radiation intensity is defined as the power through a solid angle, the decreasing power density over distance due to the [[inverse-square law]] is offset by the increase in area with distance.
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| Radiation intensity can as well characterize [[X-ray tube]] with filtration. X-ray tube output is defined for this purpose.
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| {{SI radiometry units}}
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| ==See also==
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| *[[Candela]]
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| *[[Luminous intensity]]
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| ==References==
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| {{Reflist}}
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| == External links ==
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| *[http://www.ndt-ed.org/EducationResources/CommunityCollege/RadiationSafety/theory/activity.htm Radiation: Activity and Intensity] NDE/NDT Resource Center
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| [[Category:Radiometry]]
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| [[Category:Physical quantities]]
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| {{Optics-stub}}
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Latest revision as of 06:12, 23 December 2014
The author is known by the name of Figures Wunder. My day job is a librarian. Minnesota has always been his house but his spouse desires them to transfer. One of the things she loves most is to study comics and she'll be beginning something else alongside with it.
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