Method and apparatus for determining the quality of flat glass s

Details Method and apparatus for determining the quality of flat glass s Method and apparatus for determining the quality of flat glass s

1996-10-28

1998-03-03

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With light attenuation

356239, 356445, 250571, G01B 1130

Patent

active

057241406

ABSTRACT:
A method of determining the quality of flat glass sheet comprising the steps of illuminating a glass sheet with a light ray at an acute angle. A mask having alternating opaque and transparent portions is positioned to receive light from the ray after it has struck the glass sheet. The ray is moved to a first position on the sheet to a second position and causes the light ray to move along the mask. The light passing through the mask is collected and the duration of the collected light is measured. The duration of light passing through the mask is correlated to the quality of the glass sheet that has been inspected.

REFERENCES:
patent: 5016099 (1991-05-01), Bongardt et al.
patent: 5126579 (1992-06-01), Breitmeier
patent: 5210592 (1993-05-01), Bretschneider
patent: 5251010 (1993-10-01), Maltby, Jr.
patent: 5471307 (1995-11-01), Koliopoulos et al.

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