Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-04-17
1983-06-28
Bookbinder, Marc E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
356 731, 356430, 427 10, 250550, H04M 700
Patent
active
043908977
ABSTRACT:
A technique for automatically centering a lightguide fiber (7) in a transparent plastic coating (6) having a refractive index lower than that of the fiber. The fiber (7) is passed through an applicator (14) having the coating material (6) therein to coat the fiber. Orthogonal laser beams (50 or 52) are directed at the coated fiber (5) resulting in first and second forward scattered light patterns (51 or 53) impinging on first and second screens (36 and 37). The patterns are monitored with a pair of CCTV cameras (38 and 39) and the video output signals therefrom are processed to determine the period (P.sub.1 and P.sub.2) of outboard interference fringes (61 and 62) of each pattern. The period of the interference fringes are compared to determine the difference therebetween which is proportional to the eccentricity of the fiber (7) within the coating. The position of the applicator (14) is then adjusted to center the lightguide fiber (7) in the coating (6).
REFERENCES:
patent: 3876877 (1975-04-01), Meulensteen et al.
patent: 3982816 (1976-09-01), Watkins
patent: 3999856 (1976-12-01), Unterleitner
patent: 4042723 (1977-08-01), Presby
patent: 4067651 (1978-01-01), Watkins
patent: 4124728 (1978-11-01), Marcuse et al.
patent: 4139306 (1979-02-01), Morton
B. R. Eichenbaum, "The Centering of Optical Fiber Coating by Monitoring Forward Scattering Patterns-Theory and Practice" The Bell System Technical Journal, vol. 59, No. 3, pp. 313 et seq., Mar. 1980.
H. M. Presley, "Geometrical Uniformity of Plastic Coatings on Optical Fibers" The Bell System Technical Journal, vol. 55, No. 10, pp. 1525-1537, Dec. 1976.
Bookbinder Marc E.
Coles Edward L.
Kirk D. J.
Western Electric Company Inc.
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