Fully distributed optical fiber strain sensor with 10-12 ε/√Hz sensitivity
Authors
Pereira da Costa, Luis Duarte; Fidalgo Martins, Hugo; Martín López, Sonia; Fernández Ruiz, María Del Rosario; González Herráez, MiguelIdentifiers
Permanent link (URI): http://hdl.handle.net/10017/59860DOI: 10.1109/JLT.2019.2904560
ISSN: 0733-8724
Publisher
IEEE
Date
2019-09-15Funders
European Commission
Ministerio de Economía y Competitividad
Bibliographic citation
Costa, L., Fidalgo Martins, H., Martín López, S., Fernández Ruiz, M.R. & González Herráez, M. 2019, "Fully distributed optical fiber strain sensor with 10-12 ε/√Hz sensitivity", Journal of Lightwave Technology, vol. 37, no. 18, pp. 4487-4495.
Keywords
Chirp modulation
Optical fiber applications
Optical time domain reflectometry
Phase noise
Remote sensing
Strain measurements
Vibration measurements
Project
info:eu-repo/grantAgreement/EC/FP7/307441/EU/Ubiquitous optical FIbre NErves/U-FINE
info:eu-repo/grantAgreement/EC/H2020/722509/EU/Fibre Nervous Sensing Systems/FINESSE
info:eu-repo/grantAgreement/MINECO//PCIN-2015-219/ES/MONITORIZACION DE DIQUES Y FLUJOS DE ESCOMBROS MEDIANTE NOVEDOSOS SENSORES DE FIBRA OPTICA/
info:eu-repo/grantAgreement/MINECO//TEC2015-71127-C2-2-R/ES/REDUCCION DE LOS EFECTOS DE RUIDO EN SISTEMAS DE FIBRA OPTICA NO LINEALES/
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/acceptedVersion
Publisher's version
https://doi.org/10.1109/JLT.2019.2904560Rights
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
© 2019 IEEE
Access rights
info:eu-repo/semantics/openAccess
Abstract
Advanced optical fiber reflectometry techniques enable spatially distributed measurements of true relative deformations over the length of a conventional optical fiber cable. This methodology is attractive for many applications ranging from intrusion monitoring to seismology. However, accurate quantification of the applied stimulus in general implies sophisticated implementations with poor sensitivity performance. Coherent reflectometry using chirped pulses is an appealing solution, as it provides fast dynamic strain measurements with a simple experimental deployment. Here, we analyze for the first time to our knowledge the lower performance bounds of this technique as a function of the signal-to-noise ratio of the acquired optical signal. We demonstrate that implementations realized so far have been limited by the temporal sampling used instead of the optical signal quality. Through post-processing interpolation approaches, we reach the performance limit for a given set of signal parameters, attaining unprecedented strain sensitivities (?10?12epsilon/?Hz) for km-length distributed sensors in conventional single-mode fibers.
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