The present invention relates to a device and method for making quantified
determinations of the quality of surfaces and wherein the device
comprises an optical system with a first optical means and a second
optical means as well as a control and evaluation means and an output
(display) means. Said first optical means comprises an illuminating means
having at least one LED as its light source and serves the function of
illuminating the measurement surface at a predetermined angle. Said
second optical means is likewise directed at a predetermined angle to the
measurement surface and receives the reflected light. A photo sensor of
said second optical means emits an electrical measurement signal which is
characteristic of said reflected light.The light emitted from the
illuminating means is configured such that its spectral characteristic
comprises blue, green and red spectral components in the visible light
spectrum. A filter means is arranged in the path of radiation between the
light source and the photo sensor and which changes the spectral
characteristics of the incident light so as to approach a predetermined
spectral distribution. The control and evaluation means control the
measurement sequence and evaluate the reflected light, deriving therefrom
at least one parameter which is characteristic of the surface.