On-line tension measurement in an optical fiber

Details On-line tension measurement in an optical fiber On-line tension measurement in an optical fiber

2006-12-05

2006-12-05

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

07145646

ABSTRACT:
A process of contactless monitoring the tension in an optical fiber and a tension meter which enables contactliess measurement of the tension in a bare and in a coated optical fiber. By measuring the retardation induced by the birefringence of an optical fiber by means of a polarized light beam incident to the fiber at an angle between about 10° and 25° to the detection optical axis, it is possible to accurately measure tensions over a wide range, i.e., from less than about 10 g to about 450 g. The method enables monitoring the tension during the ramp-up of the drawing process and is particularly advantageous for the control of the drawing tension in manufacturing of NZD, multimode or special fibers. Accurate monitoring of the tension both on a bare and on a coated fiber can also be achieved.

REFERENCES:
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patent: 57-196737 (1982-12-01), None
Jiro, S., “Measurement Method of Double refraction for Transparent Filament”, Patent Abstracts of Japan of JP Publication No. 55-089730, (Jul. 7, 1980).
Chu, P. L. et al., “An On-Line Fiber Drawing Tension and Diameter Measurement Device”, Journal of Lightwave Technology, vol. 7, No. 2, pp. 255-261, (Feb. 1989).

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