Time-expanded phase-sensitive optical time-domain reflectometry

Miguel Soriano-Amat; Hugo F. Martins; Vicente Durán; Luis Costa; Sonia Martin-Lopez; Miguel Gonzalez-Herraez; MaríaR. Fernández-Ruiz

doi:10.1038/s41377-021-00490-0

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Time-expanded phase-sensitive optical time-domain reflectometry

Articles

- Time-expanded phase-sensitive optical time-domain reflectometry
- Light: Science & Applications Vol. 10, Issue 3, Pages: 443-454(2021)
- Affiliations：
  
  1.Departamento de Electrónica, Universidad de Alcalá, Escuela Politécnica Superior, 28805 Madrid, Spain
  2.Instituto de Óptica "Daza de Valdés", IO-CSIC, C/Serrano 121, 28006 Madrid, Spain
  3.GROC-UJI, Institute of New Imaging Technologies, University Jaume I, 12071 Castellón, Spain
- Author bio：
  
  Miguel Soriano-Amat (miguel.soriano@uah.es)
- Funds：
- DOI：10.1038/s41377-021-00490-0
  CLC：
- Published：2021，
  
  Published Online：09 March 2021，
  
  Received：26 May 2020，
  
  Revised：03 February 2021，
  
  Accepted：08 February 2021
- Accepted：
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Soriano-Amat, M. et al. Time-expanded phase-sensitive optical time-domain reflectometry. Light: Science & Applications, 10, 443-454 (2021).
DOI：

Soriano-Amat, M. et al. Time-expanded phase-sensitive optical time-domain reflectometry. Light: Science & Applications, 10, 443-454 (2021). DOI： 10.1038/s41377-021-00490-0.

摘要

Abstract

Phase-sensitive optical time-domain reflectometry (ΦOTDR) is a well-established technique that provides spatio-temporal measurements of an environmental variable in real time. This unique capability is being leveraged in an ever-increasing number of applications

from energy transportation or civil security to seismology. To date

a wide number of different approaches have been implemented

providing a plethora of options in terms of performance (resolution

acquisition bandwidth

sensitivity or range). However

to achieve high spatial resolutions

detection bandwidths in the GHz range are typically required

substantially increasing the system cost and complexity. Here

we present a novel ΦOTDR approach that allows a customized time expansion of the received optical traces. Hence

the presented technique reaches cm-scale spatial resolutions over 1 km while requiring a remarkably low detection bandwidth in the MHz regime. This approach relies on the use of dual-comb spectrometry to interrogate the fibre and sample the backscattered light. Random phase-spectral coding is applied to the employed combs to maximize the signal-to-noise ratio of the sensing scheme. A comparison of the proposed method with alternative approaches aimed at similar operation features is provided

along with a thorough analysis of the new trade-offs. Our results demonstrate a radically novel high-resolution ΦOTDR scheme

which could promote new applications in metrology

borehole monitoring or aerospace.

关键词

Keywords

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