System and method for detecting glaze-type defects in a glass container, using polarizing filters

Abstract

A system for detecting a glaze-type defect in a glass container (200) arranged in an observation position, comprising: - a projector (100) emitting along an illumination axis (101), - a first polarizing filter (F1) having a polarization oriented at 45° relative to a central axis (AC) of the container, and arranged to filter the light beam emitted by the projector, - an image sensor (300) configured to observe at least one observation portion of the container in the observation position, the image sensor having an observation axis (301), - a second polarizing filter (F2) having a polarization oriented at 45° at plus or minus 5° relative to the central axis of the container, and arranged between the container and the image sensor, in which the illumination axis and the observation axis intersect at an angle (α) of between 10° and 150°. Figure for the abstract: [Fig. 3]