Glass manufacturing – Processes – With shaping of particulate material and subsequent fusing...
Patent
1975-07-08
1977-05-03
McGraw, Vincent P.
Glass manufacturing
Processes
With shaping of particulate material and subsequent fusing...
65 29, 65158, 250572, 356200, 356239, C03B 3702, G01N 2116
Patent
active
040212173
ABSTRACT:
Optical fibers in long line communication links fail often in tensile strength. Analysis of tensile properties reveals a variation in tensile strength with fiber length, pointing to uncommon structural defects randomly occurring along the fiber length. Failures occur from crack propagation at these defects. The defects can be revealed according to the invention by nondestructive monitoring during production via off-plane light scattering. A narrow light beam incident across the fiber diameter is refracted in a pattern characteristic of the fiber geometry. Variations in that pattern are produced by structural variations in the fiber or by surface contamination. The nature of the pattern change can indicate the type of defect.
REFERENCES:
patent: 3478218 (1969-11-01), Woellner et al.
patent: 3758787 (1973-09-01), Sigrist
patent: 3759620 (1973-09-01), Cushing et al.
patent: 3879128 (1975-04-01), Presby
Bondybey Vladimir Edmund
Brus Louis Eugene
Payne Irene Dion
Rentzepis Peter Michael
Bell Telephone Laboratories Incorporated
McGraw Vincent P.
Wilde Peter V. D.
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