Flaw detection system for light-transmitting plate material
US5387978A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Mar 5, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/1085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flaw detection system that can detect not only bubbles, stones and knots but also flaws, such as cords and reams, that are subject to less optical changes in transmitted light is provided. A glass plate travelling in a manufacturing line is scanned with a beam spot in the direction orthogonally intersecting the manufacturing line. The light transmitted through the glass plate is received by an optical-fiber array arranged in a direction orthogonally intersecting the line. Optical fibers in the optical-fiber array are connected cyclically to a plurality of photomultipliers, which convert the light received by the optical fibers into electrical signals. Flaw signals are produced by extracting flaw information signals from these electrical signals in an analog processing section, and masking them in a masking section. Positional information indicating flaw patterns and positions is produced from these flaw signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.