scholarly journals Monitoring Strategic Hydraulic Infrastructures by Brillouin Distributed Fiber Optic Sensors

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 188
Author(s):  
Manuel Bertulessi ◽  
Daniele Fabrizio Bignami ◽  
Ilaria Boschini ◽  
Marco Brunero ◽  
Maddalena Ferrario ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Strain Gauges ◽  
Mountain Valley ◽  
Concrete Members ◽  
Strain Monitoring ◽  
Hydropower Plants ◽  
Complex Structural ◽  
Monitoring Technologies

We present a case study of a Structural Health Monitoring (SHM) hybrid system based on Brillouin Distributed Fiber Optic Sensors (D-FOS), Vibrating Wire (VW) extensometers and temperature probes for an existing historical water penstock bridge positioned in a mountain valley in Valle d’Aosta Region, Northwestern Italy. We assessed Brillouin D-FOS performances for this kind of infrastructure, characterized by a complex structural layout and located in a harsh environment. A comparison with the more traditional strain monitoring technology offered by VW strain gauges was performed. The D-FOS strain cable has been bonded to the concrete members using a polyurethane-base adhesive, ensuring a rigid strain transfer. The raw data from all sensors are interpolated on a unique general timestamp with hourly resolution. Strain data from D-FOS and VW strain gauges are then corrected from temperature effects and compared. Considering the inherent differences between the two monitoring technologies, results show a good overall matching between strain time series collected by D-FOS and VW sensors. Brillouin D-FOS proves to be a good solution in terms of performance and economic investment for SHM systems on complex infrastructures such as hydropower plants, which involve extensive geometry combined with the need for detailed and continuous strain monitoring.

Strain monitoring of flexible membrane structure by using fiber-optic sensors

2004 ◽  
Vol 2004.6 (0) ◽  
pp. 253-254
Author(s):  
Kazuro Kgeyama ◽  
Hideaki Murayama ◽  
Kiyoshi Uzawa ◽  
Isamu Ohsawa ◽  
Makoto Kanai ◽  
...  
Keyword(s):  
Membrane Structure ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Flexible Membrane ◽  
Strain Monitoring

scholarly journals Comparison of methods of monitoring structure deformations based on tests of a column-plate slab

2021 ◽  
Vol 20 (4) ◽  
pp. 005-016
Author(s):  
Damian Nykiel
Keyword(s):  
Flat Plate ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Strain Gauges ◽  
Comparison Of Methods ◽  
Reinforcing Bars ◽  
Monitoring Methods ◽  
Utility Values

This work includes a comparison of the methods of monitoring the deformations of a structure on the example of a flat plate slab test. Classic ESG (electrofusion strain gauges) and modern DFOS (distributed fiber optic sensors) were compared. During the research, both types of sensors were used on some of the reinforcing bars. The study aims to indicate the differences between the compared monitoring methods, both in terms of the obtained results and their utility values.

Spatially continuous strain monitoring using distributed fiber optic sensors embedded in carbon fiber composites

2019 ◽  
Vol 58 (07) ◽  
pp. 1 ◽  
Author(s):  
Sasi Jothibasu ◽  
Yang Du ◽  
Sudharshan Anandan ◽  
Gurjot S. Dhaliwal ◽  
Rex E. Gerald ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Fiber Optic ◽  
Fiber Composites ◽  
Fiber Optic Sensors ◽  
Carbon Fiber Composites ◽  
Strain Monitoring

scholarly journals Application of distributed fiber optic sensing technique in land subsidence monitoring in coastal areas: a case study in Tianjin, China

2020 ◽  
Vol 382 ◽  
pp. 137-141
Author(s):  
Su-Ping Liu ◽  
Bin Shi ◽  
Kai Gu ◽  
Cheng-Cheng Zhang ◽  
Song Zhang ◽  
...  
Keyword(s):  
Land Subsidence ◽  
Fiber Optic ◽  
Brillouin Scattering ◽  
Coastal Areas ◽  
The Novel ◽  
Fiber Optic Sensing ◽  
Monitoring Technologies ◽  
Subsidence Monitoring ◽  
Good Agreement

Abstract. Land subsidence is a worldwide geohazard caused by various factors, and its direct impact is loss of elevation, which is especially severe in coastal areas due to sea level rise. Quantifying contributions of compressed strata is significant for evaluating the subsidence. In this paper, we used distributed fiber optic sensing (DFOS) with Brillouin scattering to monitor the strain distribution along optical cables embedded in a borehole located in Tianjin, China. The novel technique revealed that the land subsidence rate was 21.2 mm a−1 from 2017 to 2019. The strata contributed to the subsidence have been identified in the range of 3 to 35 m. The results showed good agreement with those obtained by a group of extensometers. We demonstrated that DFOS could be a supplement to land subsidence monitoring technologies in coastal areas.

3-D Woven Composites Instrumented With EFPI Fiber Optic Sensors

2002 ◽  
Author(s):  
Alexander Bogdanovich ◽  
Donald Wigent ◽  
Thomas J. Whitney ◽  
Paul A. Clark
Keyword(s):  
Fiber Optic ◽  
Mechanical Damage ◽  
Polymeric Composite ◽  
Fiber Optic Sensors ◽  
Woven Composites ◽  
Optical Wave ◽  
Strain Monitoring ◽  
Novel Approach ◽  
Wave Guides ◽  
Optical Wave Guides

A novel approach to continuous health monitoring of polymeric composite materials and structural elements using embedded Extrinsic Fabry-Perot Interferometers (EFPI) is proposed and validated. The proof of concept includes several consecutive steps. First, it is verified that simple optical wave guides survived a regular 3-D weaving process. Then EFPI sensor assemblies are manually incorporated into the preforms and it is verified that they are functional. Next step is resin infusion of instrumented preforms using VARTM method, followed by investigation of possible mechanical damage to sensor leads. Finally, test specimens are fabricated, and four-point bending tests are performed. The internal strain monitoring results provided by the embedded fiber optic sensors are compared to the data from surface foil gages. The developed approach validates, particularly, the possibility of continuous through-thickness strain monitoring, which is crucial for composite bonded and bolted joints, components with holes, openings, stiffeners, and other cases of high strain gradients.

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