Patent ID: 11933601
Assignee: SAINT-GOBAIN GLASS FRANCE
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 0:
1. An automated method for measuring geometric curvature deviations between dished surfaces of a plurality of materials to be assessed and a dished surface of a reference material, said method comprising the following steps:
(a) measuring, at selected measurement points along a defined trajectory, of a curvature profile of the dished surface of the reference material using an optical contactless detection system, said optical contactless detection system being disposed on an automatic displacement system comprising a movable arm travelling along said trajectory synchronously with the measurement of the height of the relief by the optical contactless detection system;
(b) measuring the curvature profile of the dished surface of each material to be assessed, at a same selected measurement points along the same trajectory, in same conditions of travel along said trajectory by the automatic displacement system and according to a same angle of acquisition by the optical contactless detection system at the same measurement point as for the dished surface of the reference material during step(a);
(c) calculating, by computer, at the selected points, a difference between the curvature profiles of the dished surface of each material to be assessed obtained in step (b) and a relief height or curvature profile of the dished surface of the reference material obtained in step (a).