Like the photometric definition, it is related to the luminous flux density in a particular direction, which is radiant flux density weighted by the luminosity function ( " ? " ) of the CIE Standard Observer.
22.
However, if a detector is set up to measure beam leaving in different directions, or conversely using a non-narrow beam, one can measure how much of the lost radiant flux was scattered, and how much was absorbed.
23.
It differs from radiant flux, the measure of the total power of electromagnetic radiation ( including infrared, ultraviolet, and visible light ), in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
24.
Photon mapping is another method that uses both light-based and eye-based ray tracing; in an initial pass, energetic photons are traced along rays from the light source so as to compute an estimate of radiant flux as a function of 3-dimensional space ( the eponymous photon map itself ).
25.
Where E is the spectral irradiance, \ Phi is the radiant flux of the source ( SI unit : watt, W ) within a wavelength interval \ Delta \ lambda ( SI unit : meter, m ), incident on the surface area, A ( SI unit : square meter, m?).
26.
In radiometry, "'radiant intensity "'is the radiant flux emitted, reflected, transmitted or received, per unit solid angle, and "'spectral intensity "'is the radiant intensity per unit frequency or wavelength, depending on whether the intensity " in branches of physics other than radiometry.
27.
In this context, the " absorption coefficient " measures how quickly the beam would lose radiant flux due to the absorption " alone ", while " attenuation coefficient " measures the " total " loss of narrow-beam intensity, including scattering as well . " Narrow-beam attenuation coefficient " always unambiguously refers to the latter.
28.
For example, in astronomy it is called the luminosity-to-mass ratio ( the inverse of the mass-luminosity ratio ), in physics the power density, in geology the specific radiant flux ( where specific denotes per unit mass ), in biology the specific metabolic rate, and in engineering the power-to-weight ratio.
29.
In radiometry, "'radiance "'is the radiant flux emitted, reflected, transmitted or received by a " surface ", per unit solid angle per unit " projected " area, and "'spectral radiance "'is the radiance of a " surface " per unit frequency or wavelength, depending on whether the power per unit area.
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