Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Impact of Liquids and Saturated Salt Solutions on Polymer-Coated Fiber Optic Sensors for Distributed Strain and Temperature Measurement

Martin Weisbrich
* ORCID logo ,
Dennis Messerer
* ORCID logo ,
Frank Holzer
ORCID logo ,
Ulf Trommler
ORCID logo ,
Ulf Roland
ORCID logo ,
Klaus Holschemacher
ORCID logo
Version 1 : Received: 10 June 2024 / Approved: 11 June 2024 / Online: 12 June 2024 (14:13:03 CEST)

A peer-reviewed article of this Preprint also exists.

Weisbrich, M.; Messerer, D.; Holzer, F.; Trommler, U.; Roland, U.; Holschemacher, K. The Impact of Liquids and Saturated Salt Solutions on Polymer-Coated Fiber Optic Sensors for Distributed Strain and Temperature Measurement. Sensors 2024, 24, 4659. Weisbrich, M.; Messerer, D.; Holzer, F.; Trommler, U.; Roland, U.; Holschemacher, K. The Impact of Liquids and Saturated Salt Solutions on Polymer-Coated Fiber Optic Sensors for Distributed Strain and Temperature Measurement. Sensors 2024, 24, 4659.

Abstract

The application of distributed fiber optic strain and temperature measurement can be utilized to address a multitude of measurement tasks across a diverse range of fields, particularly in the context of structural health monitoring in the domains of building construction, civil engineering, and special foundation engineering. However, a comprehensive understanding of the influences on the measurement method and the sensors is essential to prevent misinterpretations or measurement deviations. In this context, this study investigated the effects of moisture exposure, including various salt solutions and a high pH value, on a distributed strain measurement using Rayleigh backscattering. Three fiber optic sensors with different coating materials and one uncoated fiber were exposed to five different solutions for 24 hours. The study revealed significant discrepancies in deformation between the three coating types depending on the surrounding solution. Furthermore, in contrast to the prevailing literature, which predominantly describes swelling effects, a negative deformation was observed in a magnesium chloride solution. The findings of this study indicate that corresponding effects can impact the precision of measurement, potentially leading to misinterpretations. Conversely, these effects could be used to conduct large-scale monitoring of chemical components using distributed fiber optic sensing.

Keywords

DFOS; distributed fiber optic sensing; fiber optic sensor; fiber coating; strain measurement; temperature measurement; SHM; Structural Health Monitoring

Subject

Engineering, Civil Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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