| 摘要 |
a. Method and installation for monitoring longitudinal strains of fibres and in particular their excess length in an optical cable. b. Method characterised in that: - the cable is subjected to a variable elongation, known as A; - light energy pulses are simultaneously injected into at least one optical fibre of the cable via one end B of the cable; and - the variation in the propagation time of the light pulses as a function of the variation in the elongation of the cable C is measured at the other end of the cable. c. The invention relates to a method and an installation for monitoring the state of optical fibres in a cable. <IMAGE>
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