Apparatus and method for inspecting elliplicity and eccentricity

Details Apparatus and method for inspecting elliplicity and eccentricity Apparatus and method for inspecting elliplicity and eccentricity

1993-08-25

1995-04-18

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356426, G01B 1124, G01N 2184

Patent

active

054083095

ABSTRACT:
The inspection apparatus for determination of the degree of ellipticity of an optical fiber perform and the eccentricity of the core thereof comprises optical system 12 for projecting a light beam from light source 10 through optical fiber preform 1 to video camera 11; and signal processing circuit 17 for converting the image of the optical fiber preform 1 photographed by the video camera 11 into a numerical value and the apparatus is connected to driving device 14 for rotating the optical fiber preform 1 traversing the optical path of the optical system 12 around the central axis of the preform 1. The curve showing the external shape of the optical fiber preform 1 is represented by the formula: v=(a-b)Sin2.theta. and the line showing the external shape of the core represented by the formula: w=nU Sin.theta.+(n-1)(a-b)Sin(2.theta.+.alpha.). The eccentricity of the core can be calculated from these values.

REFERENCES:
patent: 4168907 (1979-09-01), Presby
patent: 5078488 (1992-01-01), Yamaguchi et al.
patent: 5118954 (1992-06-01), Grosso

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