Flaw detection system for light-transmitting plate material

Details Flaw detection system for light-transmitting plate material Flaw detection system for light-transmitting plate material

1993-03-05

1995-02-07

Hille, Rolf

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

356239, 356237, G01N 2101

Patent

active

053879783

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.

REFERENCES:
patent: 3980891 (1976-09-01), Slaker
patent: 4724481 (1988-02-01), Nishioka
patent: 4914309 (1990-04-01), Masaharu et al.
patent: 5104523 (1992-04-01), Masaharu et al.
European Search Report (93 30 1579) dated Jun. 16, 1993.
M. V. Klein, Optics, Second Edition, John Wiley & sons, pp. 476-479.

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