Method and apparatus for determining refractive index distributi

Details Method and apparatus for determining refractive index distributi Method and apparatus for determining refractive index distributi

1990-04-16

1992-01-07

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356128, G01N 2141

Patent

active

050784889

ABSTRACT:
Determination of refractive index distribution is utilized, including data of all the positions of diffraction images on a plane, from the incident ray dispersed by the cylindrical glass rod when the ray passes therethrough. A linear approximation thereof is performed; and the angle of the outgoing ray is calculated using the intersection of the approximate lineation and a plane through which the incident ray passes. Much data can be employed to calculated the angle of the outgoing ray. This substantially improves the accuracy of measurement of the angle of the outgoing ray and further this makes it possible to determine the angle even if no image of the outgoing ray is present on the plane throgh which the incident ray passes.

REFERENCES:
patent: 4441811 (1984-04-01), Melezoglu et al.
Ito et al., "Automatic Measurement of Fiber Parameters; Dimensional Nonuniformities and Refractive Index Profiles"; Rev. of the Electrical Communication Laboratories, vol. 26 #3-4 Mar.-Apr. 1978, pp. 518-525.
Proceedings of the IEEE, vol. 68, No. 10, 1980, pp. 1198-1203 IEEE, H. M. Presby et al.: "The Index-Profile Characterization of Fiber Preforms and Drawn Fibers".
IEEE Journal of Quantum Electronics, vol. QE-18, No. 10, 1982, pp. 1451-1465, IEEE, W. J. Stewart: "Optical Fiber and Preform Profiling Technology" pp. 1462-1463.

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