Fault detection apparatus for material webs

Details Fault detection apparatus for material webs Fault detection apparatus for material webs

1983-12-20

1985-07-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, G01N 2188

Patent

active

045324301

ABSTRACT:
Faults in a material web are detected by scanning the web with a beam of light along a line transverse to its direction of movement and by detecting the angular ranges into which the incident light is scattered by these faults. For this purpose a light conducting rod is arranged parallel to the scanned line in a reception plane. The light conducting rod has a stepped prism arrangement along its side surface opposite to the light inlet and the inclination of the individual, unmirrored, prism surfaces is such that specularly reflected light passes through the prisms whereas scattered light falls on the prism surfaces at angles of total reflection and is reflected to a photodetector at an end face of the light conducting rod.

REFERENCES:
patent: 4181398 (1980-01-01), Sick
patent: 4295743 (1981-10-01), Sick
patent: 4306813 (1981-12-01), Sick

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