Phase-based, high spatial resolution and distributed, static and dynamic strain sensing using Brillouin dynamic gratings in optical fibers

Arik Bergman, Tomi Langer, Moshe Tur

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A novel technique combining Brillouin phase-shift measurements with Brillouin dynamic gratings (BDGs) reflectometry in polarization-maintaining fibers is presented here for the first time. While a direct measurement of the optical phase in standard BDG setups is impractical due to non-local phase contributions, their detrimental effect is reduced by ∼4 orders of magnitude through the coherent addition of Stokes and anti-Stokes reflections from two counter-propagating BDGs in the fiber. The technique advantageously combines the high-spatial-resolution of BDGs reflectometry with the increased tolerance to optical power fluctuations of phasorial measurements, to enhance the performance of fiber-optic strain sensors. We demonstrate a distributed measurement (20cm spatial-resolution) of both static and dynamic (5kHz of vibrations at a sampling rate of 1MHz) strain fields acting on the fiber, in good agreement with theory and (for the static case) with the results of commercial reflectometers.

Original languageEnglish
Pages (from-to)5376-5388
Number of pages13
JournalOptics Express
Volume25
Issue number5
DOIs
StatePublished - 6 Mar 2017
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the Israel Science Foundation (grant No. 1380/12).

Publisher Copyright:
© 2017 Optical Society of America.

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