An optical method for measuring marble and limestone surface finish is described. This method is capable of ordering the different varieties of rocks subjected to the same industrial finishing process consistent with an arrangement made by an average human observer. The measure of finish is defined as the ratio between the specularly reflected luminous flux from a sample and the total diffused light.
© 1986 Optical Society of America
Francisco Gascón and Miguel Balbás, "Optical measurement of marble and limestone surface polish," Appl. Opt. 25, 1952-1957 (1986)