APPARATUS FOR MEASURING LIGHT REFLECTIONS OF AN OBJECT AND USE THEREOF

A method and apparatus for measuring light reflections of an object, comprising a light-source illumination-observation assembly, the assembly comprising: (A) an illumination unit comprising an illumination light source and illumination aperture stop being arranged to provide a confined luminous field, an illumination field stop ( 307 ) adapted to provide an illumination beam ( 305 ) of light from said confined luminous field, an collimating optical element ( 309 ) adapted to collimate said illumination beam and to provide an illumination field ( 313 ) on an object; (B) an observation unit comprising: at least one observation field stop adapted to provide an observation beam ( 306 ) comprising a ray boundary, at least one focusing optical element ( 309 ) adapted to focus said observation beam, an observation light receiver; and (C) at least one common optical element ( 309 ) arranged so that said illumination beam and said observation beam form an overlap therein; and (D) a unit separation stop ( 310 ) adapted to stop light from said illumination unit in reaching said observation light receiver of said observation unit; wherein said at least one observation field stops ( 308, 310, 311 ) comprises at least one limiting field stop ( 310 ) adapted to limit said ray boundary of said observation beam and to maintain said overlap of said illumination beam and said observation beam; a diffuser light-source assembly; and use thereof.