Optical Coatings & Materials Knowledge Base
A diffuse reflectance material or coating is one which exhibits Lambertian reflectance. A perfect Lambertian reflector (which doesn’t exist in reality, although Labsphere’s Spectralon comes very close to realising this ideal) is one in which the reflected intensity (i.e. flux per unit solid angle) varies with the cosine of the angle subtended between the normal to the surface and the direction of view. So the intensity is at a maximum in the direction of the normal to the surface and drops to zero at 90°.
Coincidentally, the radiance or luminance (flux per unit solid angle per unit area) reflected from a perfect diffuse reflector is constant with direction of view.
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