Method and device for detecting faults in flat glass

US6275286A · kind A · utility

Assignee

• Lasor AG · DE

Inventors

• Wolfgang Haubold · Bielefeld, DE
• Josef Droste · Glandorf, DE
• Edmund Paneff · Bielefeld, DE

Key dates

• Filing date: Sep 25, 2000
• Grant date: Aug 14, 2001
• Expiry date: Sep 25, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/896
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a method of determining the optical quality of and for detecting faults in flat glass, especially float glass, or other optically transparent materials, a video camera (1) being arranged to monitor an illuminating device (3) either through a glass (2) or by observing the reflection thereof on the glass or material, the focus being on the glass (2) and the material, respectively, and the video camera (1) generating signals in dependence on the quality of the glass (2), with these signals being evaluated, wherein an illuminating device (3) is used whose color and/or intensity is changed in a defined manner, the observation spot (6) of the video camera (1) in the faultless condition of the glass (2) is located substantially in the middle of the illuminating device (3), the illuminating device (3) has assigned thereto two video signals U.sub.1,U.sub.2, and a change of intensity of the video signals U.sub.1,U.sub.2 is used for evaluating the quality of the glass (2).