Possibilities of composite distributed fibre optic 3DSensor on the example of footing pulled out from the ground: a case study
This paper discusses in situ application of unique (patented) composite DFOS displacements sensors (3DSensors), which were embedded into the ground layers and compacted around the footing. The research was conducted to observe the potential slip plane generated during the vertical pulling of the footing out of the ground.
DFOS measurements for strain analysis of anchorage zone in 57-year-old posttensioned precast girder using static and high-frequency approach
The article presents the results of static and high-frequency strain measurements of a 57-year-old post-tensioned crane girder, dismantled from one of the production halls. The anchorage zone and transmission length of the tendon related to the quality of cement injection around the prestressing tendon were analyzed.
Smart prestressed concrete girders with integrated composite distributed fibre optic sensors (DFOS): monitoring through all construction stages
The paper discusses a real case study of prestressed concrete girders, equipped with composite DFOS strain sensors during production stage. Composite sensors with monolithic cross section (unlike commonly used layered sensing cables) were embedded into the concrete. Bonding properties responsible for accurate strain transfer mechanism were ensured by external spiral braid, analogously like for composite reinforcing bars.
Strain and displacement measurement based on distributed fibre optic sensing (DFOS) system integrated with FRP composite sandwich panel
The paper describes the concept of the smart fibre reinforced polymer (FRP) sandwich deck panel, dedicated for newly-designed and renovated bridges. This panel is equipped with the distributed fibre optic sensing (DFOS) system, integrated with composite laminates. The DFOS system is provided to control strain and displacement measurement, further used in the structural health monitoring of a bridge.
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.