Surface defect detection apparatus

Details Surface defect detection apparatus Surface defect detection apparatus

1992-10-14

1994-01-11

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

356429, 356431, 356446, 356237, 356238, 250563, G01N 2189, G01N 2155

Patent

active

052786358

ABSTRACT:
A surface defect detector for detecting a gentle wavy defect and a minute rough defect on a surface of an object. The detector has a conveyer to move the object in a linear direction, a laser beam generator to irradiate a laser beam onto the object in a direction perpendicular to the linear direction, two photoreceptors to generate two different signals in accordance with a reflection of the laser beam from the object, a separator to optically separate the photoreceptors, and a processor to process the signals from the photoreceptors to detect the gentle wavy defect and the minute rough defect.

REFERENCES:
patent: 3662181 (1972-05-01), Hercher et al.
patent: 4671663 (1987-06-01), Sick

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