Comparison of different fiber coatings for distributed strain measurement in cementitious matrices

Distributed fiber optic strain measurement based on Rayleigh scattering has recently become increasingly popular in automotive and mechanical engineering for strain monitoring and in the construction industry, especially structural health monitoring. This technology enables the monitoring of strain...

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Bibliographic Details
Published in:Journal of sensors and sensor systems 2020-07, Vol.9 (2), p.189-197
Main Authors: Weisbrich, Martin, Holschemacher, Klaus, Bier, Thomas
Format: Article
Language:English
Subjects:
Automotive engineering
Cables
Coatings
Comparative analysis
Concrete
Construction industry
Correlation analysis
Fiber coatings
Fiber optic equipment
Fiber optics
Load
Mechanical engineering
Optical fibers
Prisms
Protective coatings
Rayleigh scattering
Researchers
Sensors
Shrinkage
Strain analysis
Strain gauges
Strain measurement
Structural health monitoring
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Summary:Distributed fiber optic strain measurement based on Rayleigh scattering has recently become increasingly popular in automotive and 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 acrylate coating used 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.
ISSN:2194-878X
2194-8771
2194-878X
DOI:10.5194/jsss-9-189-2020