Importance

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Abstract

Method for determining the optical quality of a transparent plate, particularly a float glass plate, in which two parallel light beams having a reciprocal spacing are directed onto the plate under an acute angle, relative to the plate normal, the light beams reflected by the plates are received separately by a detector having a photosensitive detector and the direction of the reflected light beams is evaluated, in which all four light beams A1, A2, B1, B2 reflected by the two surfaces of the plate are received by a position-sensitive detector, the reciprocal spacing and the angle of incidence .epsilon..sub.0 of the incident light beams A, B are so adjusted as a function of the plate thickness that the reflected light beams A1, A2, B1, B2 are detected in a spatially separated manner by the detector and from the impact points of all four reflected light beams A1, A2, B1, B2 on the position-sensitive detector the parameters are calculated for the quantitative determination of the optical quality of the plate, as well as an apparatus for performing the method.

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First Claim