Method of measuring refractive index profile of cylinder

Details Method of measuring refractive index profile of cylinder Method of measuring refractive index profile of cylinder

1987-06-17

1988-05-17

Rosenberger, R. A.

Optics: measuring and testing

For optical fiber or waveguide inspection

356128, G01N 2141

Patent

active

047446544

ABSTRACT:
Parallel light rays are applied to a cylinder and true exit positions of the rays from the cylinder are measured, phantom exit positions for the incident rays are calculated by using a mathematical function representing a phantom refractive index profile, and the mathematical function is modified so as to minimize the sum of the squared differences between the true and phantom exit positions.

REFERENCES:
patent: 4227806 (1980-10-01), Watkins
patent: 4422733 (1983-12-01), Kikuchi et al.
patent: 4441811 (1984-04-01), Melezoglu et al.
patent: 4492463 (1985-01-01), Marcuse et al.
Watkins "Laser Beam Refraction Traversely Through a Graded-Index Preform to Determine Refractive Index Ratio and Gradient Profile" Applied Optics, vol. 18. No. 13 (Jul. 1, 1979) pp. 2214-2222.
P101 Preform Analyser by York Technology.
"Nondestructive Measurement of Index Profile of an Optical-Fibre Preform" by P. L. Chu, Electronics Letters, vol. 13, No. 24, 736-738 (1977).
"Measurement of Refractivce-Index Profile of Optical Fibre Preform", by P. L. Chu & T. Whitebread, Electronics Letters, vol. 15, No. 10, pp. 295-296 (1979).
"Measurement of Refractice-Index Profiles in Optical-Fibre Preforms by Spatial-Filtering Technique", by I. Sasaki, D. N. Payne, & M. J. Adams, Electronics Letters, vol. 16, No. 6 (1980).

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