The devices, systems and methods may continuously detect surface
characteristics of a sample surface at a tilt. The exemplary system may
have a conveying device for moving a sample surface, a light source for
reflecting a beam of light off the sample surface, and a light detector
with a light detection surface for continuous light detection. A lens may
be used to reflect the beam of light from the sample surface and focus
the beam of light on the light detection surface of the light detector.
The area of the beam of light at the point of focus on the light
detection surface may be unequal to the light detection surface. A
reference analyzer may be used to determine the optical surface based on
a comparison of the reflected light received with known reflected light
values for known sample surfaces.