Fiber Optic Bragg Grating Strain Sensor with Direct Reflectometric Interrogation

1996 ◽  
Author(s):  
A. D. Kersey ◽  
M. A. Davis ◽  
T. Tsai
Keyword(s):  
Fiber Optic ◽  
Strain Sensor ◽  
Bragg Grating

Fiber optic Bragg grating strain sensor in large-scale concrete structures

1993 ◽  
Author(s):  
John D. Prohaska ◽  
Elias Snitzer ◽  
Benxian Chen ◽  
Mohamed H. Maher ◽  
E. G. Nawy ◽  
...  
Keyword(s):  
Large Scale ◽  
Fiber Optic ◽  
Concrete Structures ◽  
Strain Sensor ◽  
Bragg Grating

Multiplexed fiber optic Bragg grating strain sensor system for use in marine vehicle testing

1996 ◽  
Author(s):  
Dag R. Hjelme ◽  
Bjorn Bakke ◽  
Jan S. Rambech ◽  
Steinar Neegaard
Keyword(s):  
Fiber Optic ◽  
Strain Sensor ◽  
Sensor System ◽  
Bragg Grating ◽  
Vehicle Testing ◽  
Marine Vehicle

scholarly journals Development and Application of Smart Geogrid Embedded with Fiber Bragg Grating Sensors

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Zheng-fang Wang ◽  
Jing Wang ◽  
Qing-mei Sui ◽  
Xun-mei Liang ◽  
Lei Jia ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Strain Distribution ◽  
Fiber Optic ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Tunnel Excavation ◽  
Strain Transfer ◽  
Geotechnical Structures ◽  
Higher Temperature ◽  
Geotechnical Model

Smart geogrids embedded with fiber Bragg grating (FBG) for reinforcement as well as measurement of geotechnical structures have been developed. After the fabricating process of the geogrids is detailed, finite element (FE) simulations are conducted to analyze the strain distribution of geogrids and the strain transfer characteristics from geogrids to fiber optic. Results indicate that FBG should be deployed in the middle of the geogrids rib to make sure that uniform strain distribution along the FBG. Also, PVC protective sleeves, which are used to protect fiber optic when integrated with geogrids, have smaller strain transfer loss than nylon sleeves. Tensile experiments are conducted to test strain measurement performance of proposed geogrids, and the results demonstrate that proposed smart geogrids have good linearity and consistency. Temperature experiments show that FBG embedded in geogrids has higher temperature sensitivity, and the temperature induced error can be compensated by an extra FBG strain-independent sensor. Furthermore, designed smart geogrids are used in a geotechnical model test to monitor strain during tunnel excavation. The strain tendency measured by smart geogrids and traditional strain sensor agree very well. The results indicate that smart geogrids embedded with FBGs can be an effective method to measure strains for geological engineering related applications.

scholarly journals Wind Turbine Blade Monitoring with Brillouin-Based Fiber-Optic Sensors

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Agnese Coscetta ◽  
Aldo Minardo ◽  
Lucio Olivares ◽  
Maurizio Mirabile ◽  
Mario Longo ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Fiber Optic ◽  
Strain Sensor ◽  
Experimental Tests ◽  
Fiber Optic Sensors ◽  
Composite Blade ◽  
Operation Stability ◽  
Distributed Strain ◽  
Strain Detection

Wind turbine (WT) blade is one of the most important components in WTs, as it is the key component for receiving wind energy and has direct influence on WT operation stability. As the size of modern turbine blade increases, condition monitoring and maintenance of blades become more important. Strain detection is one of the most effective methods to monitor blade conditions. In this paper, a distributed fiber-optic strain sensor is used for blade monitoring. Preliminary experimental tests have been carried out over a 14 m long WT composite blade, demonstrating the possibility of performing distributed strain and vibration measurements.

Surveillance of fiber optic and electric power cables using fiber Bragg grating sensors

1999 ◽  
Author(s):  
Francisco M. Araujo ◽  
M. Teixeira ◽  
Luis A. A. Ferreira ◽  
Ireneu M. Dias ◽  
A. Quintela ◽  
...  
Keyword(s):  
Electric Power ◽  
Fiber Bragg Grating ◽  
Fiber Optic ◽  
Bragg Grating ◽  
Power Cables ◽  
Fiber Bragg Grating Sensors ◽  
Electric Power Cables
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