Method for monitoring fiber tension by measuring fiber vibration

Details Method for monitoring fiber tension by measuring fiber vibration Method for monitoring fiber tension by measuring fiber vibration

1990-10-05

1992-01-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

65 29, 356 731, G01N 2186

Patent

active

050794337

ABSTRACT:
A new-contact method for monitoring the tension in an optical waveguide fiber during drawing is provided. The motion of the fiber is sensed in a direction transverse to the direction in which the fiber is moving. The sensed motion is analyzed to determine a plurality of frequency components thereof, each frequency component having a magnitude, and one of the components constituting the maximum magnitude component. The frequency of the maximum magnitude component is doubled to obtain a doubled frequency. The presence of a frequency component near the doubled frequency is ascertained to verify that the maximum magntiude component is the principle harmonic frequency of motion of the fiber. The tension in the fiber is then determined from the verified principal harmonic frequency component.

REFERENCES:
patent: 4317666 (1982-03-01), Faure et al.
patent: 4343637 (1982-08-01), Shofner et al.
patent: 4692615 (1987-09-01), Mensah et al.

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