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glossary
Diffusion
: phenomenon by which a radiation is deflected in various directions by interaction with other objects
Integrating sphere
: spherical cavity with a white and uniformly diffusing coating and therefore behaving as a lambertian diffuser
Lambertian diffuser
: surface diffusing light uniformely whichever the direction and therefore behaving as a lambertian light source
Albedo
: ability of a surface to reflect light defined by the ratio of reflected power to incident power
Irradiance ( radiometry )
: optical power received by unit area
Radiance ( radiometry )
: for a light source or a diffusing/reflecting surface, power emitted per unit of solid angle and per unit of apparent area
