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Radiance - Definition | | Radiance - Definition: Encyclopedia II - Radiance - Definition | | Radiance is defined by
where
the approximation holds for small A and Ω,
L is the radiance (W·m-2·sr-1),
Φ is the radiant flux or power (W),
θ is the angle between the surface normal and the specified direction,
A is the area of the source (m2), and
Ω is the solid angle (sr).
The spectral radiance (radiance per unit wavelength) is written Lλ and the radiance per unit freq ...
See also:Radiance, Radiance - Definition | | | Radiance, Radiance - Definition, Luminance, Lambertian reflectance | | |
| | | Radiance: Encyclopedia II - Radiance - Definition
Radiance - Definition
Radiance is defined by
where
the approximation holds for small A and Ω,
L is the radiance (W·m-2·sr-1),
Φ is the radiant flux or power (W),
θ is the angle between the surface normal and the specified direction,
A is the area of the source (m2), and
Ω is the solid angle (sr).
The spectral radiance (radiance per unit wavelength) is written Lλ and the radiance per unit frequency is written Lν.
Other related archivesHertz, Lambertian reflectance, Luminance, Physical quantity, Radiometry, SI, W, angle, aperture, area, diffuse, eye, geometric optics, intensity, invariant, irradiance, luminance, m-2, m2, radiant flux, radiometric, solid angle, square metre, sr, sr-1, steradian, surface normal, watt, watts
 Adapted from the Wikipedia article "Definition", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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