Preferred Label : fluence rate;
Detailed label : fluence rate, Eo;
IUPAC definition : Total radiant power, P, incident from u all directions /u onto a small sphere divided
by the cross-sectional area of that sphere. SI unit is W m-2.;
Scope note : Fluence rate is identical to spherical irradiance and reduces to irradiance, E, for
a parallel and perpendicularly incident beam not scattered or reflected by the target
or its surroundings.; Mathematical definition: Eo dP/dS dHo/dt. If the radiant power is constant over the
area S, Eo P/S. Equivalent definition: Eo 4πLdΩ, with Ω the solid angle of each beam
passing through the given point on the surface and L the radiance of the beam at that
point.;
Origin ID : FT07376;
See also
Total radiant power, P, incident from u all directions /u onto a small sphere divided
by the cross-sectional area of that sphere. SI unit is W m-2.
