Patent · US Expired

Process and device for measuring the optical quality of a glazing

US5146282A · kind A · utility

9Cited by

4References

15Claims

0Family size

Assignee

Saint-Gobain Vitrage International · FR

Inventors

Paul-Henri Guering · Aubervilliers, FR
Patrick Gayout · Villemomble, FR
Philippe Vizet · Aachen, DE

Key dates

Filing date	Jun 25, 1991
Grant date	Sep 8, 1992
Priority date	—
Expiry date	Jun 25, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG01N2021/9586
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for evaluating the optical quality of a glazing using a projection technique in which the shadow of glazing (3) projected with a localized light source (2, 15) is analyzed by a camera (6) assisted by a computer. The illumination at a point (M) of screen (4) is compared to the illumination at same point (M) in the absence of glazing (3) and the measurement is weighted by the optical and geometric parameters of corresponding point (m) of glazing (3). The resolving power in one direction is adjustable by the modification of the dimension of the source in this direction. Application is to the inspection of windshields on a production line.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.