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QUDT VOCAB Quantity Kinds Release 2.1.25
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quantitykind:RadiantEmmitance
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http://qudt.org/vocab/quantitykind/RadiantEmmitance
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Radiant Emmitance
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http://en.wikipedia.org/wiki/Irradiance
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\(M = \frac{d\Phi}{dA}\), where \(d\Phi\) is the radiant flux leaving the element of the surface area \(dA\).
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Irradiance and Radiant Emittance are radiometry terms for the power per unit area of electromagnetic radiation at a surface. "Irradiance" is used when the electromagnetic radiation is incident on the surface. "Radiant emmitance" (or "radiant exitance") is used when the radiation is emerging from the surface.