Optical fiber tension monitoring technique

Details Optical fiber tension monitoring technique Optical fiber tension monitoring technique

1991-11-27

1993-07-20

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 29, 65 311, 65162, 65DIG13, 65 12, 356385, 356429, 250559, 73581, 7386241, C03B 3700

Patent

active

052288935

ABSTRACT:
As an optical fiber (12) is being drawn, air (14) is directed at a portion of the fiber as a succession of air pulses, the pulses having a frequency near the natural frequency of the fiber portion. The frequency of the air pulses is then varied over a range of frequencies that includes the natural frequency of the fiber portion. When the air pulse frequency equals the natural frequency of the fiber portion, a resonance occurs which greatly amplifies the amplitude of the vibration of the fiber portion. The large deflection of the fiber that occurs at resonance is easy to detect, and the air pulse frequency which causes such maximum deflection is taken as being equal to the resonant frequency and therefore to the natural frequency of the fiber portion. Changes of the detected resonant frequency can be interpreted in a straightforward manner as changes in optical fiber tension which, in turn, are used to make compensatory changes of the temperature of the furnace (10).

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patent: 4957526 (1990-09-01), Frazee et al.
"An On-Line Fiber Drawing Tension and Diameter Measurement Device," P. L. Chu et al., Journal of Lightwave Technology, vol. 7, No. 2, Feb. 1989, pp. 255-261.
"Non-Contact Measurement of Optical Fiber Draw Tension," C. G. Askins et al., Journal of Lightwave Technology, vol. 9, No. 8, Aug. 1991, pp. 945-947.

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