Method for monitoring the position of a fiber

Details Method for monitoring the position of a fiber Method for monitoring the position of a fiber

1994-12-30

1996-05-21

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356356, G01B 902, G01B 1114

Patent

active

055194877

ABSTRACT:
A system for monitoring the position of a fiber (13) during drawing is provided. The system includes a beam (25) of radiation which is directed at the fiber (13), a Ronchi ruling (50) having a spatial frequency .omega..sub.M which modulates light scattered from the fiber (13), a lens system (27) having a positive focal length, and a detector (31) located in the back focal plane of the lens system. By arranging the components of the system in this manner, the distance between the fiber (13) and the Ronchi ruling (50) is a linear function of the spatial frequency .omega..sub.D of the modulated light at the detector (29). Various procedures can be used to determine .omega..sub.D, a preferred one being shown in FIG. 9.

REFERENCES:
patent: 3982816 (1976-09-01), Watkins
patent: 4067651 (1978-01-01), Watkins
patent: 4280827 (1981-07-01), Murphy et al.
patent: 5185636 (1993-02-01), Button et al.
patent: 5283628 (1994-02-01), Dotson et al.
patent: 5309221 (1994-05-01), Fischer et al.
patent: 5408308 (1995-04-01), Allegretto et al.
"Measurement of Optical Fiber Diameter Using the Fast Fourier Transform", Applied Optics, vol. 19, pp. 2031-2033 (1980).*

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