Process and apparatus for the detection of flaws in transparent

Details Process and apparatus for the detection of flaws in transparent Process and apparatus for the detection of flaws in transparent

1982-02-17

1985-01-08

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250572, 356239, G01N 2189

Patent

active

044924771

ABSTRACT:
The present invention relates to a method for checking flat transparent surfaces permitting the discrimination between the flaw in the matter and dirt which has been deposited on the surface but does not affect the flatness or the transparency of the sheet. The apparatus includes a photosensitive captor located above the sheet to be checked. The captor is arranged at the limits of a fuzzy real image which an optical system gives in the plane of this captor of a light source located below the sheet. In this way, a flaw causes the excitation of the captor at a level higher than the normal light threshold of the fuzzy image because of refraction caused by the flaw in the matter. In contrast, the presence of dirt will cause, through occultation, an excitation lower than the normal light threshold thereby enabling differentiation between the flaw and the dirt. The apparatus further includes an electronic assembly for analyzing the signals provided by the captor for driving a device for marking the surface bearing a flaw at the exact spot where the flaw is located. The present invention may be used for checking glass sheets during their manufacturing in continuous or cut out glass sheets for example.

REFERENCES:
patent: 2803755 (1957-08-01), Millford
patent: 3445672 (1969-05-01), Marks
patent: 3877821 (1975-04-01), Price et al.
patent: 4038554 (1977-07-01), Craig
patent: 4223346 (1980-09-01), Neiheisel et al.
patent: 4227178 (1981-07-01), Cushing et al.
patent: 4308959 (1982-01-01), Hoover et al.

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