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Multiplexed optical fibre strain sensing using cross-correlation of subcarrier interferometric spectra

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3 Author(s)
Volanthen, M. ; Optoelectron. Res. Centre, Southampton Univ., UK ; Geiger, H. ; Dakin, J.P.

A novel technique for evaluating strain in multiple long-length sections of optical fibre is described. Sections defined by reflective markers are interrogated with subcarrier interferometry. Pathlength changes are monitored using cross-correlation. A resolution of 35 μm has been obtained over 5 m sensing sections, together with inter-section crosstalk levels below -45 dB

Published in:

Electronics Letters  (Volume:32 ,  Issue: 3 )