Patent ID: 6097493
Filing Date: 2000-08-01
Classification: G01N

Abstract:
A granular object evaluation device which evaluates a quality and a shape of a transparent or translucent granular object, the device comprising:a feeding means which feeds an individual granular object into a measuring area;a detecting means in which a detection viewing line is directed to said measuring area and which receives reflected light from the granular object located at said measuring area;an illuminating means which is located between said detecting means and said measuring area, has a center area through which said detection viewing line passes, and irradiates light to the granular object fed into said measuring area by said feeding means;a light shielding plate which is located between said illuminating means and said detecting means, prevents the light from said illuminating means from being directly incident on said detecting means, and has an opening through which said detection viewing line passes;a shielding mask which is arranged with said detection viewing line as the center and which covers a predetermined area of said illuminating means with said detection viewing line as the center so that light that is parallel to the detection viewing line and emitted from said illuminating means at said predetermined area is prevented from being directly incident on the granular object; anda control means which analyzes detected signals from said detecting means and evaluates the quality and the shape of the granular object.