Highly-sensitive distributed dynamic strain sensing via perfect periodic coherent codes

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Distributed dynamic strain sensing is of interest in applications such as structural health monitoring, shape sensing and more. Achieving high spatial resolution along with high sensitivity, fast update rate and long range is a challenging task. A potential approach for improving the performance of distributed strain sensors is via coding. Despite its great success in Stimulated Brillouin Scattering based sensors and the significant attention it drew in the context of static reflectometry, its application for Rayleigh Scattering based dynamic strain sensing was rarely studied. In this work, a biphase Legendre sequence with near perfect periodic autocorrelation was used for significantly enhancing the performance of a coherent φ-OTDR DAS system. The new method experimentally detected 175Hz sinusoidal dynamic strain of amplitude ~ 2nε . The spatial resolution was 14.7cm, the range was 1km and the noise level corresponded to sensitivity of ~ 70 pε √.

Original languageEnglish
Title of host publicationOptical Fiber Sensors, OFS 2018
PublisherOptica Publishing Group (formerly OSA)
ISBN (Print)9781943580507
DOIs
StatePublished - 2018
EventOptical Fiber Sensors, OFS 2018 - Lausanne, Switzerland
Duration: 24 Sep 201828 Sep 2018

Publication series

NameOptics InfoBase Conference Papers
VolumePart F124-OFS 2018
ISSN (Electronic)2162-2701

Conference

ConferenceOptical Fiber Sensors, OFS 2018
Country/TerritorySwitzerland
CityLausanne
Period24/09/1828/09/18

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