Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1988-10-06
1990-02-13
Willis, Davis L.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
250562, 356238, G01N 2189
Patent
active
049001531
ABSTRACT:
An optical surface inspection apparatus for material webs comprises an illuminating means (11) for generating a strip of light (12) on the surface (19) to be inspected and a light receiving means (13) which receives the light emitted (diffusely reflected) from the surface region illuminating by the strip of light (12) and directs it to a photoreceiving arrangement, which delivers a signal representative of web faults to an electronic processing circuit (16). The light receiving means (13) has at least one row camera (14) which receives light remitted from a line illuminated by the strip of light (12) and forms an image of the line on the diode row (15). The light receiving means is also arranged at such a shallow observing angle .alpha. relative to the tangential plane to the surface at the location of the strip of light (12) that faults (20) which project slightly out of the surface appear to the row camera (14) in shadow outline against the light background of the strip of light (12).
REFERENCES:
patent: 3841761 (1974-10-01), Selgin
patent: 4099884 (1978-07-01), Nash
patent: 4671663 (1987-06-01), Sick
Ostertag Klaus
Weber Klaus
Erwin Sick GmbH - Optik-Elektronik
Koren Matthew W.
Willis Davis L.
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