Comparison between different fiber coatings and adhesives on steel surfaces for distributed optical strain measurements based on Rayleigh backscattering
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Published:2018-11-21
Issue:2
Volume:7
Page:601-608
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ISSN:2194-878X
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Container-title:Journal of Sensors and Sensor Systems
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language:en
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Short-container-title:J. Sens. Sens. Syst.
Author:
Weisbrich MartinORCID, Holschemacher Klaus
Abstract
Abstract. Optical fiber measurement systems have recently gained popularity following a
multitude of intensive investigations. A new technique has been developed for
these measurement systems that uses Rayleigh backscatter to determine the
distributed strain measurement over the total length of a fiber. These
measurement systems have great potential in civil engineering and structural
health monitoring. This paper addresses some preliminary comparisons between three different
fiber coatings and six different adhesives on steel structures. The results
are based on a bending test with specimens made of precision flat steel;
optical fiber strain measurements were compared with photogrammetric strain
measurements. Analysis of the test data showed a strong correlation between the optical
measurement system's results and the theoretical results up to the yielding
point of the steel. Furthermore, the results indicate that fibers with the
Ormocer® and polyimide coatings have almost
the same strain values as the reference measurement method. The main results of this investigation are a guideline describing how to
attach optical fibers to steel surfaces for distributed fiber optical strain
measurements and recommendations for coatings to obtain realistic strain
values. Additionally, the advantages of distributed strain measurements were
revealed, which illustrates the potential of Rayleigh backscattering
applications.
Publisher
Copernicus GmbH
Subject
Electrical and Electronic Engineering,Instrumentation
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