Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

Comparison of Different Fiber Coatings for Distributed Strain Measurement in Cementitious Matrices

Version 1 : Received: 4 November 2019 / Approved: 6 November 2019 / Online: 6 November 2019 (10:37:20 CET)
Version 2 : Received: 4 March 2020 / Approved: 5 March 2020 / Online: 5 March 2020 (15:24:39 CET)

A peer-reviewed article of this Preprint also exists.

Journal reference: Journal of Sensors and Sensor Systems 2020, 9, 189-197
DOI: 10.5194/jsss-9-189-2020

Abstract

The distributed fiber optic strain measurement based on Rayleigh scattering has recently become increasingly popular in automotive or mechanical engineering for strain monitoring and in the construction industry, especially structural health monitoring. This technology enables the monitoring of strain along the entire fiber length. This article addresses integrating optical fibers of different coatings into the concrete matrix to measure the shrinkage deformations. However, previous studies do not give a clear statement about the strain transfer losses of fiber optic sensors in this application. In this context, three different coating types were investigated regarding their strain transfer. The fibers were integrated into fine-grained concrete prisms, and the shrinkage strain was compared with a precise dial gauge. The analysis shows a high correlation between the reference method and the fiber measurement, especially with the Ormocer coating. The used acrylate coating is also consistent in the middle area of the specimen but requires a certain strain introduction length to indicate the actual strain. The main result of this study is a recommendation for fiber coatings for shrinkage measurement in fine-grain concretes using the distributed fiber optic strain measurement. In addition, the advantages and disadvantages of the measurement method are presented.

Subject Areas

Rayleigh backscatter; distributed optical strain measurement; fiber optic; concrete; shrinkage; coating

Comments (1)

Comment 1
Received: 5 March 2020
Commenter: Martin Weisbrich
Commenter's Conflict of Interests: Author
Comment: The whole article was revised. We include specific details about the sensing principle, concrete material, and temperature compensation. Some grammatical errors were fixed, and the reference list was updated.
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