Method for testing specimens

Details Method for testing specimens Method for testing specimens

1982-06-28

1985-02-26

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

65 29, 65160, G01N 2184, G01N 2189

Patent

active

045014922

ABSTRACT:
A method and device for testing specimens, such as optical fibers or preforms from which optical fibers are produced, to discover defects in the specimen includes creating a spatial frequency spectrum of the specimen, filtering the spectrum by projecting it onto a spatial frequency filter and evaluating the portion or component of the spectrum passing through the filter.

REFERENCES:
patent: 3539260 (1970-11-01), Burch
patent: 3658420 (1972-04-01), Axelrod
patent: 3743423 (1973-07-01), Heinz et al.
Kitayama et al., "Determination of Mode Power Distribution in a Parabolic-Index Optical Fibers: Theory and Application", IEEE J. of Quan. Electronics, vol. QE-15, No. 10, Oct. 1979, 1161-1165.
H. M. Presby et al., "Optical Fiber Preform Diagnostics", Applied Optics, vol. 18, No. 1, Jan. 1, 1979, pp. 23-30.

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