Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-07-07
1977-01-18
Smith, Alfred E.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250572, 356200, G01N 2132
Patent
active
040041522
ABSTRACT:
Apparatus for inspecting a web of material for faults or aberrations which affect the remission and reflection of light incident on the material. A first cylindrical lens focuses light scanned over the length of the lens on the material and intercepts light which is remitted by the material. A first light conducting rod is positioned outside the angle of reflection of the light by the material and captures the remitted light. It is disposed on the side of the first cylindrical lens opposite the material so that the remitted light first passes through the first cyclindrical lens. A second cylindrical lens is positioned between the first rod and the first lens for concentrating the remitted light on an envelope region of the first rod. A second light conducting rod captures light reflected by the material and is positioned within the angle of reflection of the light within the angle of reflection of the light by the material. Photo-sensitive devices are in light communication with at least one end face of each light conducting rod and they generate electrical output signals that are responsive to the remitted and the reflected light captured by the first and second light conducting rods. Means for logically associating the output signals is also provided.
REFERENCES:
patent: 3060319 (1962-10-01), Greunke
patent: 3317738 (1970-12-01), Piepenbrink et al.
patent: 3331963 (1967-07-01), Lippke
patent: 3574469 (1971-04-01), Emerson
patent: 3784832 (1974-01-01), Sewell
Obser Werner
Pinior Gernot
Erwin Sick GmbH - Optik-Elektronik
Grigsby T. N.
Smith Alfred E.
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