Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-23
1993-08-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 731, G01V 904
Patent
active
052332004
ABSTRACT:
This invention is a process of contactless monitoring the tension in a moving fiber, such as during the process of drawing optical fibers from preforms, and a non-contacting tension gauge which allows measurement of fiber tension at line speed. The device can be used to monitor the tension during the run without any adverse effects on fiber performance. The measurement may be steady, intermittent or sinusoidal as appropriate. The process includes the steps of sensing an initial position of a moving optical fiber, applying a gas jet onto a section of the optical fiber in a direction transverse to the direction of movement of the fiber so as to cause deflection of the moving fiber axially of the gas jet, sensing the magnitude of deflection of the fiber relative to the said initial position, and, depending on the magnitude of deflection, adjusting the tension in the fiber so as to cause the change in the magnitude of deflection to a preselected value. The monitoring is especially suitable for monitoring the tension in an optical fiber being drawn from a heated preform, the tension being adjusted by adjusting the temperature of the fiber-drawing furnace.
REFERENCES:
patent: 4692615 (1987-09-01), Mensah
patent: 5079433 (1992-01-01), Smith
patent: 5113708 (1992-05-01), Bode et al.
patent: 5130557 (1992-07-01), Kettl
DiMarcello, et al. "Fiber Drawings and Strength Properties", Optical Fiber Communications, vol. 1, pp. 179-248, T. Li, ed., Academic Press, Inc., 1985.
Askins et al. "Noncontact Measurement of Optical Fiber Draw Tension", Journal of Lightwave Tech., vol. 9, No. 8, pp. 945-947, (1991).
DiMarcello Frank V.
Hart, Jr. Arthur C.
Huff Richard G.
Walker Kenneth L.
Alber Oleg E.
AT&T Bell Laboratories
Le Que T.
Nelms David C.
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