Instrument for measuring optical fibre length

Details Instrument for measuring optical fibre length Instrument for measuring optical fibre length

G - Physics

01

B

G01B 11/02 (2006.01) G01S 17/10 (2006.01)

Patent

CA 2068599

ABSTRACT An instrument is provided for measuring the length of an optical fibre by measuring the transit time of an optical pulse signal travelling along the fibre. The transit time is measured using an electronic counter which is started at the transmission of the optical signal and stopped at its reception. A microprocessor controls the light source such that it generates an optical pulse signal at a repetition frequency uncorrelated with respect to the repetition frequency of the pulses counted by the counter. The time required for the pulse signal to travel the length of the fibre is obtained by computing the arithmetic mean value of a large number of counting values supplied by the counter.

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