Patent ID: 6331889
Filing Date: 2001-12-18
Classification: G01N,G11B

Abstract:
A method for inspecting a large-area article having at least two opposing outer layers (14, 15) which are at least partially transparent, and at least one intermediate layer (16) located between the outer layers, comprising the steps of:optical sensing of opposing sides (23a, 23b) of the article (11) with at least two optical receivers (12, 13);allocating data of recorded image points of one of said optical receivers (12) to data of recorded image points of the other of said optical receivers (13) so opposing points (22a, 22b) of the article are allocated to each other for evaluation; andidentifying a potential error (17) in the intermediate layer (16) when said data of said opposing image points indicate an error in the case of both optical receivers.