Optical fiber Bragg grating sensor assembly for 3D strain monitoring and its case study in highway pavement

Zhou, Zhi; Liu, Wanqiu; Huang, Ying; Wang, Huaping; He, Jianping; Huang, Minghua; Jin-ping, OU

doi:10.1016/j.ymssp.2011.10.003

Cited by 140 publications

(75 citation statements)

References 10 publications

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“…To prevent sudden failure of the highway system, real-time monitoring of the system was recommended on the road, after 15 years of severely damaged pavement -FBG based sensor assembly was proposed in various layers of the highway pavement system to monitor the 3D strain distribution and assess its various influencing factors for road deterioration monitoring ( Figure 6) [16]. Even there were found reasonably high deviations between in-situ measurements and mathematically simulated with the finite element method, this 3-dymentionl strain measurement system and can eventually be employed in sensing for intelligent vehicle highway systems and health monitoring systems for civil structures, such as bridges [16].…”

Section: Shm Technologies For Pavement and Bridge Structuresmentioning

confidence: 99%

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: Shm Technologies For Pavement and Bridge Structuresmentioning

confidence: 99%

Review on structural health interrogation using fiber bragg grating sensors

Šķēls

Janeliukštis

Haritonovs

2018

Engineering for Rural Development

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“…When there is enough space for sensor installation, the bond length is usually at least 30 mm to allow sufficient strain transfer. When the strain sensor is used as the sensing component which transforms other quantity into strain, due to the space limitation in some situations for sensor miniature and geometrical constraints [10], the bond length may be only 15 mm or even shorter. Hence, two different bond lengths 15 mm and 30 mm, are considered.…”

Section: Summary Of the Mechanical Model And Global Sensitivity Amentioning

confidence: 99%

“…However, when OFBG strain sensor is used to transform other physical or chemical quantities to strain while the bond length is limited for miniature of sensor or other constraints, short bond length is the only choice (as in the case of 3D strain sensor in [10]). For short bond length, even under uniform strain field, the strain transfer factor varies from about 60% to 100%.…”

Section: B Effects Of Bond Lengthmentioning

confidence: 99%

“…There are many methods available to interrogate the Bragg wavelength from OFBG sensors [6], [7]. The most common applications of optical fibre strain sensor are to measure strain for structural health monitoring/evaluation [8]- [10], damage detection of fibre reinforced polymeric composites [11]- [13], fatigue crack monitoring [14] as well as many experimental works in structural and material engineering [15], [16]. In addition, OFBG strain sensors are used as the major sensing component for monitoring different physical (force, acceleration, pressure, displacement,temperature, humidity) and chemical (pH, chemical concentration) quantities [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Sensitivity Analysis of Surface Attached Optical Fiber Strain Sensor

Wan

2014

IEEE Sensors J.

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Abstract-Optical fibre strain sensors, especially the fibre Bragg grating (FBG) type, are widely applied in different applications. The most common installation method is surface-attached. In principle, optical fibre strain sensor with adequate sampling and signal processing techniques is usually more accurate than electrical resistive strain gauge. However, the strain of the surface of structure may not transfer to the sensing element perfectly. The ratio between the measured and actual strain can be correlated by a strain transfer factor (STF). However, it depends on the material and geometrical properties of the optical fibre and adhesive. It is non-economical and impractical to measure STF for every installed sensor. It is desirable to identify the most sensitive parameters on the variation of STF so that the quality control and assurance procedure can be performed more efficiently. In this paper, a quantitative global sensitivity analysis, called extended Fourier amplitude sensitivity test will be performed to compute the first-order and total sensitivity indexes based on a well-established semi-analytical/empirical mechanical model of three material and five geometrical parameters of both integral and OFBG type optical fibre strain sensor with two different kinds of polymeric coating under three types of strain field in sixteen different configurations. From the detail analysis, the most sensitive parameters on STF are bond length, the thickness of adhesive beneath the optical fibre and the deviation of grating position, which are related to workmanship instead of the material properties of optical fibre and adhesive.Index Terms-optical fibre strain sensor, strain transfer, extended Fourier amplitude sensitivity test, global sensitivity analysis.

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“…All these strains contain the significant information about the engineering structure safety [1,2]. Therefore, interior strain information is needed [3] to investigate the health condition of the civil structure. However, conventional strain monitoring methods, such as strain gauge, can not measure multi-dimensional interior strain of the engineering structure effectively.…”

Section: Introductionmentioning

confidence: 99%

Same origin three-dimensional strain detection FBG sensor based on elliptical ring and its optimization

et al. 2015

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Abstract:In order to achieve the same origin three-dimensional (3D) strain measurement, one three-dimensional (3D) fiber Bragg grating (FBG) strain sensor is proposed in this paper. The metal structure of this sensor is composed by three elliptical rings with different geometrical parameters. All these elliptical rings make sure that this sensor achieves the same origin 3D strain detection and increases the strain measurement coefficient. A theory calculation model of this sensor is established. The finite element method is utilized to optimize this sensor and verify the correctness of the theory model. After sensor optimization, 1 mm is chosen as the radical thickness of this sensor based on taking high strain detection coefficient and structure strength into account. To further obtain detection characteristics of this sensor, the calibration experiment is carried out. Experimental data of FBG1 which is the core sensitive element of this sensor is chosen as the specimen to be analyzed by the least square method. When the wavelength of FBG1 is changed by external stress, wavelengths of FBG2 and FBG3 have just a little fluctuation maybe caused by the fiber demodulation instrument SM125. So sensitive elements (FBG1, FBG2, and FBG3) of this sensor have no crosstalk problem for three-dimensional detection. After data analysis, the measuring coefficient of FBG1 is 0.05 nm/N. Similarly, the coefficients of FBG2 and FBG3 are 0.045 nm/N and 0.39 nm/N, respectively. All these data confirm that this sensor could achieve the same origin 3D strain measurement without the crosstalk problem and has certain practical applications.

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Optical fiber Bragg grating sensor assembly for 3D strain monitoring and its case study in highway pavement

Cited by 140 publications

References 10 publications

Review on structural health interrogation using fiber bragg grating sensors

Review on structural health interrogation using fiber bragg grating sensors

Quantitative Sensitivity Analysis of Surface Attached Optical Fiber Strain Sensor

Same origin three-dimensional strain detection FBG sensor based on elliptical ring and its optimization

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