Measuring the size of pyramids on a textured surface.

摘要

A method for measuring an average size (Ps) of pyramid pyramids outwardly extending on a textured surface of an object (6), the method comprising - issuing from a source (12) of light a light beam following a first direction over a region (21) of the textured surface, - measuring an intensity (I) of light received from that region along a second direction, and - processing the measured intensity to obtain the average size of pyramids, wherein the average size of pyramids is determined using a predetermined relationship between the intensity (I) of the light received along the second direction and said size of pyramid, where the pyramid size increases with increasing intensity of received light.