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| Radiometry: Lambertian source geometry | Parent topic |
Fig. 1. A lambertian light source with an elementary area, dA n , radiating into the right hemisphere, generates a uniform angular distribution of radiance, L (left panel; red arrow and semi-circle that represents an intersection of a hemispherical surface, L = const, with a plane collinear with the normal). The angle ξ is measured between the normal and the observation direction. Hence, the angular distribution of the source intensity is I(ξ ) = I0 cos ξ, where I0 is the intensity along the normal (right panel; green arrow and circle that represents an intersection of a spherical surface, the locus of I, with a plane collinear with the normal).
| CITATION: Jonasz M. 2009. Radiometry: Lambertian source geometry (www.tpdsci.com/Tpc/RdmLambSrcFig.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 19-Jan-2009 Modified: 13-Jul-2009 Peer-reviewed: PENDING |
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