Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1992-11-27
1994-03-15
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356375, 348 88, 348 92, G01B 1100, G01N 2188
Patent
active
052949737
ABSTRACT:
An apparatus and a technique for determining body ply cord distribution in a calendered fabric sheet. Test strips are cut from the sheet and formed in a roll with the cords extending parallel to the axis of the roll and normal to the end thereof. The end of the roll is then exposed to polarized light, accentuating light intensity differences between the cross sectional area of the cut cords and the elastomeric material in which they are embedded. A digitized image of the spiral end of the roll is generated and the resulting pixels are analyzed to determine the locations of the center points of each of the cords. Finally, the distances separating the center points of adjacent cords are determined and, if they fall above or below predetermined thresholds, a determination is made that the calendered fabric sheet is not acceptable for forming body plies.
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patent: 3918816 (1975-11-01), Foster et al.
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patent: 4857749 (1989-08-01), McCarty
patent: 4980902 (1990-12-01), Hegland et al.
patent: 5206720 (1993-04-01), Clothiaux et al.
Bridgestone/Firestone Inc.
Evans F. L.
Thomas David A.
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