Method for measuring geometric deviations between the dished surfaces of a plurality of materials to be assessed and a dished surface of a reference material
AssigneeSaint-Gobain Glass France
InventorsAdrien CARLU, Alexandre MARLIER
Life of this patent
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Abstract
An automated method measures geometric curvature deviations between dished surfaces of a plurality of materials to be assessed and a dished surface of a reference material. The method calculates, by computer, at selected points, a difference between the curvature profiles of the dished surface of each material to be assessed and a relief height or curvature profile of the dished surface of the reference material.
Claims18
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 a contactless detection system, said contactless detection system being disposed on an automatic displacement system travelling along said trajectory synchronously with the measurement of the height of the relief by the 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 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).
An automatic system for measuring geometric curvature deviations between the dished surfaces of a plurality of materials to be assessed and a dished surface of a reference material, said system comprising an assembly formed by
- at least one automatic displacement system adapted to travel along at least one trajectory defined along dished surfaces, and
- at least one contactless detection system adapted to measure a relief height or curvature of dished surfaces, disposed on the automatic displacement system and synchronized with the movements of said automatic displacement system;
- said system being configured to:
- measure, at selected measurement points along a defined trajectory, the relief height or curvature profile of the dished surface of the reference material, and
- measure the relief height or curvature profile of the dished surface of each material to be assessed, at the same selected measurement points along the same trajectory, in the same conditions of travel along said trajectory by the automatic displacement system and according to a same angle of acquisition by the contactless detection system at the same measurement point as for the dished surface of the reference material.
Dependencies are inferred from the claim text.