scholarly journals Fiber-Reinforced Polymer-Packaged Optical Fiber Bragg Grating Strain Sensors for Infrastructures under Harsh Environment

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
Zhi Zhou ◽  
Zhenzhen Wang ◽  
Lian Shao
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Strain Sensors ◽  
Fiber Reinforced Polymer ◽  
Bragg Grating ◽  
Harsh Environment ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Sensing Performance ◽  
Optical Fiber Bragg Grating

Optical fiber Bragg grating (FBG) has been recognized as an outstanding high-performance local monitoring sensor and is largely applied in structural health monitoring (SHM). This paper proposes a series of fiber-reinforced polymer- (FRP-) packaged optical fiber Bragg grating strain sensors to completely meet the requirements of rough civil engineering infrastructures, and their sensing performance under normal environment and harsh environment is experimentally investigated. It is experimentally and theoretically proved that FRP-packaged FBG strain sensors maintain excellent sensing performance as the bare FBG sensor under a harsh environment, and their durability is significantly enhanced due to the FRP materials. These FRP-packaged FBG strain sensors are successfully applied in the SHM system of Aizhai Bridge.

Fiber Bragg Grating Sensing for Long-Lived Fiber Reinforced Polymer Structures

2004 ◽  
Vol 88 (3) ◽  
pp. 154-159
Author(s):  
Seishi Yamada ◽  
Hiro-Yuki Nakazawa ◽  
Iwao Komiya ◽  
Yukihiro Matsumoto
Keyword(s):  
Fiber Bragg Grating ◽  
Fiber Reinforced Polymer ◽  
Bragg Grating ◽  
Fiber Reinforced ◽  
Reinforced Polymer

Characterization of Embedded Optical Fiber Bragg Grating Sensors

1998 ◽  
Vol 531 ◽  
Author(s):  
A. Frank ◽  
Ph. M. Nellen ◽  
U. Sennhauser
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Bragg Gratings ◽  
Bragg Grating ◽  
Structural Elements ◽  
Fiber Reinforced ◽  
Fiber Sensors ◽  
Fiber Bragg Grating Sensors ◽  
Optical Fiber Bragg Grating

AbstractFiber reinforced structural elements equipped with optical fiber sensors are of potential interest for long term surveillance of bridges, dams, and other civil engineering applications. We report herein on the embedding of optical fiber Bragg grating sensors into continuously pultruded glass fiber reinforced epoxy material (GFRP) rods used as structural elements.Two fibers, one with acrylic, one with polyimide coating, and fiber Bragg gratings were extensively characterized. The residual axial strain after embedding was measured. Temperature and strain coefficients of Bragg gratings during quasi-static cycling and temperature cycling tests were monitored and compared to extensometric and resistance strain gauge measurements.The effect of fiber embedding was also studied with push-out tests giving information about adhesion properties like surface bond energy, lateral stress, and coefficient of friction.For sensor purposes long term characteristics of the conversion factor between the measured Bragg grating wavelength and strain or temperature in the specimen have to be known to identify best-suited coatings for embedding and protecting fiber sensors and for obtaining reliability data on sensor performance.

Experimental study on the mechanical and self-sensing behaviors of prestressed carbon fiber–reinforced polymer reinforced concrete composite structures

2020 ◽  
Vol 23 (8) ◽  
pp. 1507-1520
Author(s):  
Guan Wang ◽  
Caiqian Yang ◽  
Chunlin Meng ◽  
Zhenxue Xia ◽  
Yong Pan ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Fiber Bragg Grating ◽  
Composite Structures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Bragg Grating ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

A type of self-sensing prestressed carbon fiber–reinforced polymer reinforced concrete composite structure was proposed and studied, composed of reinforced concrete beam, prestressed carbon fiber–reinforced polymer plate, and long-gauge fiber Bragg grating sensors. The carbon fiber–reinforced polymer plate was prestressed and bonded to the bottom of the reinforced concrete beam. Two types of anchorage systems were compared and studied. The long-gauge fiber Bragg grating sensors were used as active elements for the self-sensing of mechanical responses, which were installed on the tensile rebars, carbon fiber–reinforced polymer plates, and concrete. A series of static and fatigue 4-point flexural experiments were carried out to study the bending and fatigue performances of the composite structures. After a prescribed number of fatigue loading cycles, monotonic flexural bending was performed to investigate the deterioration of properties. The results showed that the long-gauge fiber Bragg grating sensor is valid for the mechanical response sensing of the proposed structures. The compatibility of the prestressed carbon fiber–reinforced polymer plate and concrete in the pure bending zone is excellent even under fatigue loading. The load-carrying capacities were improved by more than 30% due to the application of prestressed carbon fiber–reinforced polymer plates. The stiffness was also improved remarkably and generally decreased with the accumulation of fatigue cycles linearly.

Dynamic Eccentricity Induced in Induction Motor Detected by Optical Fiber Bragg Grating Strain Sensors

2016 ◽  
Vol 16 (12) ◽  
pp. 4786-4792 ◽  
Author(s):  
Kleiton Morais Sousa ◽  
Uilian Jose Dreyer ◽  
Cicero Martelli ◽  
Jean Carlos Cardozo da Silva
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Induction Motor ◽  
Strain Sensors ◽  
Bragg Grating ◽  
Dynamic Eccentricity ◽  
Optical Fiber Bragg Grating
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