Method and apparatus of measuring outer diameter and structure o

Details Method and apparatus of measuring outer diameter and structure o Method and apparatus of measuring outer diameter and structure o

1987-08-14

1989-11-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 731, 356384, G01N 2186

Patent

active

048824976

ABSTRACT:
A method of and apparatus for examining the structure of an optical fiber such as eccentricity, clad and core diameters, and nonroundness of clad. The structure of the optical fiber can be accurately determined by irradiating the side wall of the optical fiber with a light such as a white light, a monochromatic light or the like in the direction perpendicular to the axis of the optical fiber, detecting an image of the light transmitted through the optical fiber and/or diffraction fringes formed by lights diffracted by the outer edge of the optical fiber to obtain a luminance distribution of the light traversing the optical fiber, and calculating the luminance distribution to thereby obtain accurate structural parameters of the optical fiber.

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Ito et al., "Automatic Measurements of Fiber Parameters; Dimensional Nonuniformities and Refractive Index Profiles", Review of Electrical Communication Laboratories, vol. 26, No. 3-4, 3/78, pp. 518-525.
Millar, "A Measurement Technique for Optical Fiber Break Angles", Optical and Quantum Electronics, 13, No. 2, 3/81, pp. 125-131.

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