The intensity distribution of diffuse reflections
can be well approximated by the Lambert's Law .
For example, an ideal mirror does not have any diffuse reflection
and for this reason the physical surface of the mirror cannot be seen.
The law of reflection will apply only with a perfect mirror but diffuse reflection
(scattering) will occur when measuring to solids.
Increasing the amount of scattering in the resin system will increase the amount of diffuse reflection
(white light) which is mixed with the reflected colored light generated by the pigment interactions.
Finally, a Type-4 error results from the neglect of diffuse reflection
off the target surface, [[sigma].
This surface is designed to give uniformly diffuse reflection
so that any light entering the sphere is uniformly distributed over the entire inner surface, eliminating any directional effects.
Other mid-infrared sampling methods that have been used to examine coatings include transmission spectroscopy of material abraded from a surface, emission spectroscopy, and the more recently applied methods of photoacoustic and diffuse reflection
Compatibility with leading fiber optic probe manufacturers means a wide range of diffuse reflection
, transflection, and transmission sample interfaces are available for almost any sample process.
The CPC Diffuse Swap Top module makes the diffuse reflection
sampling technique easy and reliable.
This new development encompasses through-beam photo-electric sensors with a range of 6m, retroreflective photo-electric sensors with polarized optics and a range of up to 2,5m, as well as a diffuse reflection
scanner with background suppression.
In the case of polymer films, there is a variation in reflection due to the roughness of the surface that scatters the incident light in all directions, causing the reduction of intensity in the specular direction and an increase in diffuse reflection