Distributed fibre optic sensing: Reinforcement yielding strains and crack detection in concrete slab during column failure simulation
The structural behaviour of the RC slab-column structure was controlled using advanced measurement techniques, including DFOS. Despite the extensive state of the art in distributed sensing, the paper provides the new knowledge gained during research. It is mainly related to extremely high (post-yield) strain measurements thanks to the excellent bonding properties and strain transfer to the optical fibre from both steel reinforcement and surrounding concrete.
New Distributed Fibre Optic 3DSensor with Thermal Self-Compensation System: Design, Research and Field Proof Application Inside Geotechnical Structure
The design and applications of the new DFOS sensor dedicated to 3D displacement sensing are described in the article. The novelty of the presented solution lies in several features, including design, application, production technology and materials. This paper is focused on the operational rules governing DFOS and proving their effectiveness in the laboratory and geotechnical field applications.
Distributed Fibre Optic Sensing (DFOS) for Deformation Assessment of Composite Collectors and Pipelines
The article presents an approach for monitoring displacements and strains in Glass Fiber Reinforced Polymer (GFRP) collectors and pipelines using DFOS. The research verifies the effectiveness of the proposed monitoring solution for the health monitoring of composite pipelines. Analysis of strain profiles allowed for calculating the actual displacements (shape) of the pipe within its cross-section plane using the trapezoidal method
Monitoring of Large Diameter Sewage Collector Strengthened with Glass-Fiber Reinforced Plastic (GRP) Panels by Means of Distributed Fiber Optic Sensors (DFOS)
The issue of selecting appropriate sensors enabling correct strain transfer is discussed in the article, indicating both limitations of layered cables and the advantages of sensors with monolithic cross-section design in terms of reliable measurements. The results obtained thanks to monolithic DFOS sensors are presented on the example of real engineering structure - the Burakowski concrete collector in Warsaw during its strengthening with glass-fibre reinforced plastic (GRP) panels.
New hydraulic sensor for distributed and automated displacement measurements with temperature compensation system
The study aims to present the design and practical application of a new hydraulic sensor dedicated to vertical displacement sensing. The novelty of the presented solution lies in several features, including the possibility of performing automatic measurements and compensating the results due to temperature effects. The article describes the sensor’s design, laboratory tests, and final application within the geotechnical structure.