Apparatus and method for inspecting optical fibers

Details Apparatus and method for inspecting optical fibers Apparatus and method for inspecting optical fibers

1991-07-23

1992-07-21

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

051317435

ABSTRACT:
An optical pulse of a fixed width is applied to an optical fiber, back scattering light from the optical fiber is converted to an electric signal, which is converted to a digital signal by sampling with a fixed period. In a difference calculating section an average of digital signals at a first sample point and at W sample points preceding the first sample point is used as data at the first sample point, and an average of digital signals at a second sample point and at W sample points following the second sample point, which is after the first sample point by a number of sample points corresponding to the width of the optical pulse, is used as data at the second sample point. The difference between the data at the first sample point and the data at the second sample point is calculated for each of a series of sample points to obtain difference waveform data. Changing points of the difference waveform data are detected and a spliced point of the optical fiber is decided, based on the detected changing points.

REFERENCES:
patent: 4848463 (1990-02-01), Sakamoto et al.

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