Fibre Bragg gratings in structural health monitoring—Present status and applications

Majumder, Mrinmoy; Gangopadhyay, Tarun Kumar; Chakraborty, Akshoy Kumar; Dasgupta, Kamal; Bhattacharya, D. K.

doi:10.1016/j.sna.2008.04.008

Cited by 849 publications

(483 citation statements)

References 95 publications

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“…Conversely, the reflected wavelength of the FBG is reduced when the FBG is subjected to pressure or placed in an environment with a decreasing temperature. The required physical value can be determined by incorporating the shift variation of the front and back portions of the reflective wavelength into the Bragg reflection equation as shown here: (6,7) λ = 2n eff Λ,…”

Section: Working Principle Of Fbg Sensorsmentioning

confidence: 99%

Monitoring Curing of Quasi-Isotropic Carbon Fiber/Epoxy Composite Using Fiber Bragg Grating Sensors

2016

Sensors and Materials

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In this study, four fiber Bragg grating (FBG) sensors were embedded into a quasi-isotropic carbon fiber/epoxy composite material to monitor curing. The spectra of the FBG sensors were shifted and deformed during the curing process. This phenomenon is caused by residual strain during composite curing. We monitored the spectral changes of the embedded FBG sensors in different laminate layers to measure the residual strain during curing. According to the experimental results, the curing residual strain of the composite was generated first from the central layer. The maximum axial and lateral residual strains measured by the FBG sensors were −456.7 and 1234.6 µε, respectively. The FBG sensors have advantages for use in the stress-strain sensing of composites.

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Section: Working Principle Of Fbg Sensorsmentioning

confidence: 99%

Monitoring Curing of Quasi-Isotropic Carbon Fiber/Epoxy Composite Using Fiber Bragg Grating Sensors

2016

Sensors and Materials

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“…The reflected fiber Bragg grating center wavelength can be expressed using the following formula. (10) λ B = 2n eff Λ…”

Section: Principles Of Fbg Sensorsmentioning

confidence: 99%

Novel Optical Fiber Pressure Sensor Using Embedded Fiber Bragg Grating in Acrylonitrile Butadiene Styrene Structure

2015

Sensors and Materials

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In this study, we propose a novel optical fiber pressure sensor based on fiber Bragg grating (FBG). This sensor is simple and has the advantages of being robust and inexpensive. The optical fiber pressure sensor consists of an embedded FBG sensor and an acrylonitrile butadiene styrene (ABS) rectangular cuboid structure. A numerical analysis model of an ABS structure under various pressure loadings is also presented in this paper. A pressure calibration test is carried out to examine the strain variations of the optical fiber pressure sensor at various hydraulic pressures. From the experimental results, the hydraulic pressure is from the 0-10 bar; the pressure sensor will change the wavelength conversion with a variable of 380 με. The proposed optical fiber pressure sensor shows a good linear relationship between the water pressure loading and the wavelength shift.

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“…The use of optical fiber sensor in concrete engineering is a result of the interdisciplinary science cultivation of optical fiber, optoelectronics, microelectronics, artificial intelligence, composite materials science, as well as structural engineering. However, comparing overall characteristic, optical fiber sensor has better facility and superiority than any other sensors so that it becomes the main option for sensing process of the concrete structure [2]. Distributed optical fiber sensor can be applied as planted smart structure to observe temperature, strain, and vibration of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Damage Detection Tool Design of Lightweight Concrete Using Optical Fiber Sensor and Phototransistor

Asriani

Pamudji

Susilawati

et al. 2017

IJITEE

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Abstract-The developments in the construction of buildings, roads, and bridges commonly use concrete as the main material due to its strength and hardiness. However, the quality of the concrete may decrease due to some factors namely the age of the concrete, temperature, pressure, tension, etc. Thus, it is important to monitor its condition to find out any small damage such as cracks. Utilizing optical fiber power loss, a sensor capable of detecting cracks on a concrete can be made. This research uses multimode fiber optic planted inside the concrete. Sensor variation model being planted is in the form of wave. The lightweight concrete is designed using plastic aggregate. A specific tool capable of responding the change of the laser power coming through the fiber optic using phototransistor is also made in this research. The concrete is tested using two testing equipment at a time namely pressure testing that uses UTM (Universal Test Machine) to assess mechanical loading. Testing out the concrete using designed result tool is done by shooting laser on one side of the optical fiber and read the output power. During the test, the concrete is loaded continually and gradually increases using the UTM. The source of the light is laser, 850 nm of length. The result of the experiment and tool testing show that when the quality of the concrete decreases, laser power output through optical fiber increases.

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Fibre Bragg gratings in structural health monitoring—Present status and applications

Cited by 849 publications

References 95 publications

Monitoring Curing of Quasi-Isotropic Carbon Fiber/Epoxy Composite Using Fiber Bragg Grating Sensors

Monitoring Curing of Quasi-Isotropic Carbon Fiber/Epoxy Composite Using Fiber Bragg Grating Sensors

Novel Optical Fiber Pressure Sensor Using Embedded Fiber Bragg Grating in Acrylonitrile Butadiene Styrene Structure

Damage Detection Tool Design of Lightweight Concrete Using Optical Fiber Sensor and Phototransistor

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