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| Radiometry: Radiance law in non-uniform media - alternative derivation | Parent topic |
Fig. 1. Geometry of the radiance law in non-uniform media: dΦ - radiant flux which propagates within an elementary solid angle, dωS, in the source-containing medium (with a refractive index mS) and within an elementary solid angle, dωR, in the receiver-containing medium (with a refractive index mR), dA is the elementary area at the interface, n is the normal to that area. The layout of the drawing implies that mS1 > mR2. The azimuth angles φ are equal to each other because refraction does not affect the azimuth angle of a light ray. Factor T represents the power transmission through the interface. The radiance law in uniform media assures that the radiance at the source side of the interface is tha same as that of the source. It also ensures that radiance at the receiver source of the interface is the same as that at receiver.
| CITATION: Jonasz M. 2007. Radiometry: Radiance law in non-uniform media - alternative derivation (www.tpdsci.com/Tpc/RdmRadERLwNUAlt.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 19-Jan-2007 Modified: 07-Mar-2008 Peer-reviewed: PENDING |
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