Absorption cross section: Difference between revisions

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|Meaning=The area that, when multiplied by the [[irradiance]] of [[electromagnetic  waves]] incident on an object, gives the [[radiant flux]] absorbed and dissipated by the object. Customary  usage in [[radar]] describes the absorption cross section of an object as the area that, when  multiplied by the [[power density]] of incident plane-wave [[radiation]], gives the [[power]] absorbed and  dissipated by the object.
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|Explanation=The [[extinction cross section]] of an object is the sum of the absorption cross section and the  [[scattering cross section]]. For a medium consisting of a [[dispersion]] of absorbing objects through  which radiation propagates, the [[volume absorption coefficient]] (units: m<sup>2</sup>m<sup>-3</sup> or m<sup>-1</sup>) at a given  location in the medium is the sum of the [[absorption]] cross sections of all the objects in a unit  volume centered at that location.
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== absorption cross section ==
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<div class="definition"><div class="short_definition">The area that, when multiplied by the [[irradiance]] of [[electromagnetic  waves]] incident on an object, gives the [[radiant flux]] absorbed and dissipated by the object. Customary  usage in [[radar]] describes the absorption cross section of an object as the area that, when  multiplied by the [[power density]] of incident plane-wave [[radiation]], gives the [[power]] absorbed and  dissipated by the object.</div><br/> <div class="paragraph">The [[extinction cross section]] of an object is the sum of the absorption cross section and the  [[scattering cross section]]. For a medium consisting of a [[dispersion]] of absorbing objects through  which radiation propagates, the [[volume absorption coefficient]] (units: m<sup>2</sup>m<sup>-3</sup> or m<sup>-1</sup>) at a given  location in the medium is the sum of the [[absorption]] cross sections of all the objects in a unit  volume centered at that location.</div><br/> </div>
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Latest revision as of 22:06, 27 March 2024

The area that, when multiplied by the irradiance of electromagnetic waves incident on an object, gives the radiant flux absorbed and dissipated by the object. Customary usage in radar describes the absorption cross section of an object as the area that, when multiplied by the power density of incident plane-wave radiation, gives the power absorbed and dissipated by the object.

The extinction cross section of an object is the sum of the absorption cross section and the scattering cross section. For a medium consisting of a dispersion of absorbing objects through which radiation propagates, the volume absorption coefficient (units: m2m-3 or m-1) at a given location in the medium is the sum of the absorption cross sections of all the objects in a unit volume centered at that location.

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