Pipeline corrosion assessment using embedded Fiber Bragg grating sensors

Liang, Xiao; Huang, Ying; Galedari, S. Abuali; Azarmi, Fardad

doi:10.1117/12.2083963

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Therefore, such environmental conditions can be measured according to changes in the value of λ B (i.e., Δ λ B ) obtained from an FBG based on Equation . At present, the distributed measurement of strain ( ε ) and temperature changes (Δ T ) are the primary focus of research for FBG sensors, and Δ λ B can be expressed accordingly as follows:

\frac{normalΔ λ_{B}}{λ_{normalB}} = ((), 1 - Ρ_{e}) ε + ((), α + ξ) normalΔ T = k_{ε} ε + k_{T} normalΔ T

where P e is the optical elasticity coefficient, which accounts for effect on λ B owing to changes in the core diameter and grating length due to ε , α is the thermal expansion coefficient, which accounts for effect on λ B owing to changes in the grating length due to the thermal expansion effect, and ξ is the thermal‐optical coefficient of the fiber core, which accounts for the effect on λ B owing to changes of n due to Δ T . k ε and k T are the sensitivity coefficients for the strain and temperature, respectively.…”

Section: Operational Principlesmentioning

confidence: 99%

“…Therefore, such environmental conditions can be measured according to changes in the value of λ B (i.e., Δλ B ) obtained from an FBG based on Equation (1). At present, the distributed measurement of strain (ε) and temperature changes (ΔT) are the primary focus of research for FBG sensors, and Δλ B can be expressed accordingly as follows 27 :…”

Section: General Operational Principles Of Fbg Sensorsmentioning

confidence: 99%

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Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Meng

Sun

Wang

2019

Struct Control Health Monit

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Summary Excessive subgrade permanent deformation resulting from heavy vehicle traffic and freezing–thawing cycles is one of the primary causes of road damage in seasonally frozen regions. In this paper, an implanted cantilever sensing beam based on fiber Bragg gratings (FBGs) is proposed for subgrade deformation monitoring. Two optical fibers with inscribed FBGs were adhered to the opposite external sides of a PVC pipe which was selected as substrate. After laboratory calibration tests, the cantilever sensing beam was installed horizontally through the subgrade of a testing section. The beam will be bended driven by the deformation of the soils under the action of vehicles, and the deformation is recorded by the FBGs and calculated through principles of continuum mechanics. The subgrade deformation is considered to be the deflection of the sensing beam. The feasibility of the developed method was validated based on the results of field testing conducted for a three‐year period. It has been found that the combination of freezing–thawing cycles with heavy vehicle loading magnifies the extent of permanent subgrade deformation. The developed FBG‐based implanted cantilever sensing beams are thereby demonstrated to provide a feasible and effective approach for the in situ monitoring of subgrade deformation.

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\frac{normalΔ λ_{B}}{λ_{normalB}} = ((), 1 - Ρ_{e}) ε + ((), α + ξ) normalΔ T = k_{ε} ε + k_{T} normalΔ T

Section: Operational Principlesmentioning

confidence: 99%

Section: General Operational Principles Of Fbg Sensorsmentioning

confidence: 99%

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Meng

Sun

Wang

2019

Struct Control Health Monit

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“…Tere are several FOS solutions for corrosion detection which utilize diferent sensing approaches [13][14][15][16]. One principle of operation employs fber Bragg grating (FBG) corrosion sensors based on tensile stress relaxation and volume expansion [17][18][19][20][21][22][23]. In the frst case, i.e., tensile stress relaxation detection, the fber is pretensioned; thus, when the corrosion occurs, the relaxation of the fber grating instigates a wavelength shift.…”

Section: Introductionmentioning

confidence: 99%

High-Order Fiber Bragg Grating Corrosion Sensor Based on the Detection of a Local Surface Expansion

Budinski

Njegovec

Pevec

et al. 2023

Structural Control and Health Monitoring

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This paper presents a fiber optic sensor for the detection of corrosion processes that occur on metal surfaces. In the proposed sensor design, a sensing fiber with an inscribed high-order Bragg grating is attached to the observed metal surface. A broadening of high-order Bragg grating spectral characteristics is observed and used to detect small and highly localized longitudinal strain variations that occur along the fiber as a result of corrosive rust flakes’ formations beneath the sensing fiber. The proposed approach provides a straightforward fabrication method, the possibility for unobtrusive mounting, including mounting of the sensor beneath the corrosion-protective layers, and consistent corrosion detection yields.

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Pipeline corrosion assessment using embedded Fiber Bragg grating sensors

Cited by 2 publications

References 14 publications

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

Fiber Bragg grating sensors for subgrade deformation monitoring in seasonally frozen regions

High-Order Fiber Bragg Grating Corrosion Sensor Based on the Detection of a Local Surface Expansion

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