| 摘要 |
The invention relates to a method and device for determining the optical quality of and for detecting faults in flat glass (2) and in other transparent materials, especially float glass. To this end, a video camera (1) views an illuminating device (3) through the glass (2) or the reflection, whereby the focus is on the glass (2) or on the sheet, the video camera (1) generates signals according to the quality of the glass (2), and said signals are evaluated. At least one illuminating device (3) is used. Said illuminating device has a pattern (4) of adjacent differing partial sections (5a, 5b) which alternate at least in color and/or in the intensity thereof. An examination spot of the video camera (1) records the pattern (4). Two video signals (U1, U2) are assigned to the signal of the pattern (4), and a variation of the video signal (U1, U2) is utilized in order to assess the quality of the glass (2) or of the sheet.
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