Apparatus for determining faults in strip material

Details Apparatus for determining faults in strip material Apparatus for determining faults in strip material

1979-06-18

1981-10-20

Rosenberger, R. A.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250572, G01B 1130

Patent

active

042957435

ABSTRACT:
Apparatus for determining faults on strip material includes a scanning device for linewise scanning of a strip of material with a light beam, a first cylindrical lens extending parallel to the direction of the scanned lines and arranged to image the scanned line on a first cylindrical mirror with its focal line at right angles to the direction of the scanned lines.
Faults in the surface of the strip material such as dents, bumps and scratches give rise to characteristic deviations or deflection of the scanning light and the arrangement of the first cylindrical lens and first cylindrical mirror produce a convenient spatial distribution of the light in the image field of the first cylindrical mirror which can be detected by suitably disposed detectors to yield information about the nature and location of the fault. The apparatus includes various other optical components to produce a desired grouping of the deviated light beams to aid their identification and subsequent analysis. The apparatus can also operate with transmitted light. The particular arrangements shown are characterized by their compact arrangement.

REFERENCES:
patent: 3198951 (1965-08-01), Lentze
patent: 4085322 (1978-04-01), Sick
patent: 4116527 (1978-09-01), Sick

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