Process and device for measuring the optical quality of a glazin

Details Process and device for measuring the optical quality of a glazin Process and device for measuring the optical quality of a glazin

1991-06-25

1992-09-08

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

356127, 358106, G01N 2188

Patent

active

051462826

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.

REFERENCES:
patent: 4299482 (1981-11-01), Task
patent: 4398822 (1983-08-01), Task
patent: 4453827 (1984-06-01), Taboada
patent: 4647197 (1987-03-01), Kitaya et al.

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