Patent ID: 6734449
Filing Date: 2004-05-11
Classification: G01N

Abstract:
Device for detection of the location of an edge (2) of a transparent, anisotropic material (3,3â€²) comprising: at least one sensor (1) with a light source (4), two polarization filters (6,7) with transmission axes (8,9) meeting at a 90Â° angle as well as a light detector (10), whereby the light source (4) and one polarization filter (6) are located on one side of the edge (2) to be detected and the second polarization filter (7) and the light detector (10) are located on the other side and whereby at least one of the sensors (1) can be arranged and/or configured so that various angles (32) between the transmission axis (8) of the first polarization filter (6) and the optical axis (14) of the transparent, anisotropic material (3,3â€²) are possible.