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| | | #REDIRECT [[Irradiance]] |
| #REDIRECT [[irradiance]] | |
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| == irradiance ==
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| <div class="definition"><div class="short_definition">(''Or'' radiant flux density.) A radiometric term for the rate at which [[radiant energy]] in a [[radiation]] field is transferred across a unit area of a surface (real or imaginary) in a hemisphere of directions.</div><br/> <div class="paragraph">In general, irradiance depends on the orientation of the surface. The radiant energy may be confined to a narrow [[range]] of frequencies (spectral or [[monochromatic]] irradiance) or integrated over a broad range of frequencies. Irradiance follows from [[radiance]] but not, in general, vice versa. The photometric equivalent of irradiance is [[illuminance]], obtained by integrating [[spectral irradiance]] times [[luminous efficiency]] over the [[visible spectrum]]. <br/>''See'' [[Poynting vector]].</div><br/> </div>
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| [[Category:Terms_I]]
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