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| Radiometry: Transmission of power through an interface | Parent topic |
Fig. 1. Geometry of the transmission of power through an interface between two uniform media with refraction indices, m'1 and m'2. Notation: dΦ - radiant flux which propagates within an elementary parallel pencil of rays (subscripts i, r, and t, denote the incident, reflected, and transmitted power, respectively), dA1 - cross-sectional area of both the incident and reflected pencils, dA2 - cross-sectional area of the refracted pencil, γ1 - incidence (and reflection) angle, γ2 - refraction angle.
Note that the relationships between the magnitudes of the power incident at, reflected from, and transmitted through the interface depend on the polarization, incidence angle, and on the relationship between the refractive indices of the two media. In particular, at incidence angles greater than the angle of total internal reflection (see Transmission of irradiance ...), which exists when m'1 > m'2 and the radiation is incident at the interface from the side of medium 1, the transmitted power equals 0.
| CITATION: Jonasz M. 2007. Radiometry: Power transmission through an interface (www.tpdsci.com/Tpc/RdmPowTsm.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: 06-Feb-2008 Modified: 06-Mar-2008 Peer-reviewed: PENDING |
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