[2.11] Ft (at a point in space)
The omnidirectional radiant flux externally incident on an elementary sphere, per unit cross-sectional area of the sphere.
{ F }_{ t }=d\Phi /da\left [=\int _{ 4\pi }^{ }{ Ld\omega } \right ]
where da is the cross-sectional area of the sphere.
« Back to Definitions Index