Optical time domain reflectometer with automatic measuring funct

Details Optical time domain reflectometer with automatic measuring funct Optical time domain reflectometer with automatic measuring funct

1988-11-23

1990-02-06

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

048984639

ABSTRACT:
A light source supplies an optical pulse to a target optical fiber. A light receiver produces an electric signal corresponding to reflection light from the target optical fiber. A processor performs digital processing on the electric signal to thereby produce waveform data. A level computing section computes level difference data for a predetermined unit interval of the waveform data. A comparator compares the level difference data with a first threshold value and produces reference position data indicating a position where the level difference data exceeds the first threshold value. A detector retrieves that level difference data which is located within a predetermined range preceding and succeeding the reference position data, to thereby detect first and second position data indicating preceding and succeeding constant-value start points, and detect first level data included in the waveform data, which corresponds to a point attained by adding the predetermined unit interval to the first position data, and second level data of the waveform data which corresponds to the second position data. A judging section acquires difference data indicating a difference in level between the first and second level data and determines a defective point in the target optical fiber by comparing the difference data with a second threshold value.

REFERENCES:
patent: 4527113 (1985-07-01), Hillerich
patent: 4606632 (1986-08-01), Hillerich
patent: 4732469 (1988-03-01), Souma

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