Method for monitoring optical fiber drawing

Details Method for monitoring optical fiber drawing Method for monitoring optical fiber drawing

1979-06-11

1980-12-02

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 11W, 65 13, 65 29, 356201, C03B 3702

Patent

active

042369045

ABSTRACT:
Local transmission loss of optical fibers can be measured in "real time" with the disclosed non-destructive technique. Similarly, the technique allows determination of the presence and location of structural defects. It can be used to monitor the fiber drawing process, to adjust the process in response to the information derived by use of the technique, and to monitor and adjust the cabling process. It is based on the launching of light pulses into the fiber through the reservoir of material from which the fiber is being drawn, and the analysis of the light scattered back through the fiber and the reservoir. The back-scattered light is detected, and the time elapsed between launching of the light pulse and detecting light is used to determine the location of the scatterer.

REFERENCES:
patent: 4021217 (1977-05-01), Bondybey et al.
patent: 4081258 (1978-03-01), Goell et al.
IBM Technical Disclosure, vol. 14, #11, Apr. 1942, Mancini, pp. 3294-3295.
Applied Optics, vol. 16, #9, Sep. 1977, Barnoski et al., pp. 2375-2379.
Applied Optics, vol. 15, #9, Sep. 1976, Barnoski et al., pp. 2112-2115.
Bell System Technical Journal, vol. 56, #3, Personick, Mar. 1977, pp. 355-366.
Technishes Messen Atm V 3713-3715, Hillerich, 1976, pp. 269,270.

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