Fiber Optic Sensors for Structural Health Monitoring of Air Platforms

Guo, Honglei; Xiao, Gaozhi; Mrad, Nezih; Yao, Jianping

doi:10.3390/s110403687

Cited by 263 publications

(135 citation statements)

References 67 publications

(80 reference statements)

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“…In comparison to other FOS, the FBG sensor technology offers additional advantages, for example, Fabry-Perot interferometric sensors cannot be efficiently stacked or multiplexed and long gauge FOS are not suitable for registering impact events, which is crucial in safe aircraft service [5]. Typical FBG sensor characteristics are shown in Table 1.…”

Section: Investigation and Analysis Of Fbgmentioning

confidence: 99%

“…This again involves more wires and costs [4; 5].FBG sensors are a proper substitute to the conventional piezoceramic sensors [2; 4] to register the high frequency waves because no complex wiring is required. These sensors offer an attractive possibility for the full-scale monitoring of structural components thanks to the sensor multiplexing in a single fibre [5].…”

Section: Ultrasonics-based Damage Detectionmentioning

confidence: 99%

“…Grid period Λ, nm is the distance between two, adjacent peaks of the refractive index [5]. Because of its structure, the FBG reflects the wavelengths of a certain length of light λ B from certain optical fibre points, but does not affect the propagation of other wavelengths in the grid.…”

Section: Investigation and Analysis Of Fbgmentioning

confidence: 99%

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Review on structural health interrogation using fiber bragg grating sensors

Šķēls

Janeliukštis

Haritonovs

2018

Engineering for Rural Development

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Abstract. Fibre Bragg Grating sensors are optical fibre sensors that are now widely used in civil, mechanical and aerospace engineering for structural health monitoring and damage detection purposes. Typical parameters to be measured are strain and temperature, but also rotation, pressure, vibrations, the distance between stationary and moving or rotating components and concentration of chemical substances can be registered. These sensors have numerous advantages with respect to their piezoelectric counterparts, such as light weight, small dimensions, immunity to electromagnetic interference caused by nearby electronic devices. One of the most notable advantages of Fibre Bragg Grating sensors is the multiplexing capability, meaning that several tens to hundreds of sensors can be stacked together to increase the number of measurement points. This is a key advantage in structural health monitoring and damage detection in aerospace, pavement, bridge and other structures, where numerous points on the structure are subjected to high stresses. Moreover, fibre optical sensors are fully passivethey are capable of functioning without power supply. This review paper deals with highlighting the usage of Fibre Bragg Grating sensors in structural health monitoring and damage detection in various types of structures, namely, civil structures (bridges, pavements) and lightweight structures (aircraft, thin-walled composites), thus underlining a great significance of these sensors in structural safety.Keywords: optical fibre, FBG sensors, damage detection, SHM. Optical sensors overviewOptical fibres consist of two concentric silica layers, namely, the core and the cladding. The small differences in refractive index between both layers ensure the condition of total internal reflection of light inside the fibres, making the optical fibres efficient waveguides. Fibre optical sensors (FOS) comprise the core with a diameter of about 8 µm made of silica doped with germanium oxide and a cladding layer with a diameter of 125 µm made of pure silica. The smallest signal attenuation 0.2 dB/km is achieved at the wavelength of 1.550 nm [1].The essential difference between conventional and fibre optical sensors (FOS) is that FOS are passive -they are capable of fully functioning without power supply. Providing electrical power to the sensor in remote areas for road pavements, bridges or aircraft can be a very difficult task. FOS are sensitive to temperature, pressure, strain, gas concentration, vibrations, the distance between stationary and moving or rotating components, etc. and the raw FOS measurements are in a form of wavelength information, which is analysed and processedto reveal the vital information about the health state of the structure [2]. Optical sensors also provide higher accuracy compared to electronic analogues. This is due to the fact that the light wavelength is much shorter (1.3-1.5 µm) than the radio waves used in wireless systems (in GHz, wavelength measured in centimetres).The most promising type of fibre optic sensors ...

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Section: Investigation and Analysis Of Fbgmentioning

confidence: 99%

Section: Ultrasonics-based Damage Detectionmentioning

confidence: 99%

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Review on structural health interrogation using fiber bragg grating sensors

Šķēls

Janeliukštis

Haritonovs

2018

Engineering for Rural Development

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“…In the recent past, the FBG sensing system was successfully used in the structural health monitoring (Liehr et al 2008;Guo et al 2011) and in monitoring the slope stability (Dijcker et al 2011;Nöther et al 2012). In railway engineering, it was used to monitor the strains induced in rails, and for estimating the weight and speed of trains (Lee et al 2004;Yoon et al 2011).…”

Section: Instrumentation To Capture Internal Lateral Strains In Ballamentioning

confidence: 99%

A laboratory investigation to assess the functioning of railway ballast with and without geogrids

Hussaini

Indraratna

Vinod

2016

Transportation Geotechnics

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Understanding the complex load transfer mechanism and the subsequent accumulation of deformation in ballast and subballast layers under repeated wheel loading is essential to design resilient rail tracks. Large-scale cyclic tests have been conducted on railroad ballast instrumented with optical based fibre Bragg grating (FBG) sensors, LVDTs, pressure plates and the settlement pegs to explore the role of geogrid and its interaction with ballast in improving the track performance. Latite basalt and geogrids with different aperture sizes were used for the investigations. The laboratory experimental results indicate that the geogrid inclusions enhance track performance by arresting the lateral spreading of ballast and thereby significantly reducing the extent of its vertical settlement. In contrast, the reinforcement of ballast with geogrid has only a marginal effect on reducing the settlement in the subballast layer. The results also show that geogrid minimises the amount of particle breakage, the effectiveness of which is governed by its placement position, with lowest breakage occurring when the geogrid is placed at a location 130 mm above the subballast. In addition, geogrids also reduce the extent of vertical stress in the subgrade soil. The laboratory test results establish beyond doubt the effectiveness of FBG sensing system in capturing the ballast movement under cyclic loading. Disciplines Engineering | Science and Technology Studies

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“…An effective SHM method can increase efficiency, reduce maintenance and inspection costs, and extend the service life of mechanical systems and structures. An overview of literature in the field of optical methods indicates that fiber Bragg grating (FBG) sensor technology is considered a promising and commonly used method for evaluating and monitoring structural system response and damage detection [1].…”

Section: Introductionmentioning

confidence: 99%

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

Nicolas¹,

Sullivan²,

Richards

2016

Aerospace

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Abstract:Technological advances have enabled the development of a number of optical fiber sensing methods over the last few years. The most prevalent optical technique involves the use of fiber Bragg grating (FBG) sensors. These small, lightweight sensors have many attributes that enable their use for a number of measurement applications. Although much literature is available regarding the use of FBGs for laboratory level testing, few publications in the public domain exist of their use at the operational level. Therefore, this paper gives an overview of the implementation of FBG sensors for large scale structures and applications. For demonstration, a case study is presented in which FBGs were used to determine the deflected wing shape and the out-of-plane loads of a 5.5-m carbon-composite wing of an ultralight aerial vehicle. The in-plane strains from the 780 FBG sensors were used to obtain the out-of-plane loads as well as the wing shape at various load levels. The calculated out-of-plane displacements and loads were within 4.2% of the measured data. This study demonstrates a practical method in which direct measurements are used to obtain critical parameters from the high distribution of FBG sensors. This procedure can be used to obtain information for structural health monitoring applications to quantify healthy vs. unhealthy structures.

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Fiber Optic Sensors for Structural Health Monitoring of Air Platforms

Cited by 263 publications

References 67 publications

Review on structural health interrogation using fiber bragg grating sensors

Review on structural health interrogation using fiber bragg grating sensors

A laboratory investigation to assess the functioning of railway ballast with and without geogrids

Large Scale Applications Using FBG Sensors: Determination of In-Flight Loads and Shape of a Composite Aircraft Wing

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