Quantitative Sensitivity Analysis of Surface Attached Optical Fiber Strain Sensor

Wan, Kai Tai

doi:10.1109/jsen.2014.2303145

Cited by 20 publications

(15 citation statements)

References 37 publications

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“…A similar approach was reported by Li et al [20] in their model tests. On the other hand, much research has been carried out to characterize the interfacial behavior between OFSs and manmade materials, or the strain transfer efficiency from host materials to fiber cores [21]- [26]. On theoretical grounds, a few interaction theories have been proposed [27]- [31], but these models can hardly be extended to interpret the fiber/soil interaction as they do not explicitly account for normal pressure.…”

mentioning

confidence: 99%

Quantitative Evaluation of Optical Fiber/Soil Interfacial Behavior and Its Implications for Sensing Fiber Selection

et al. 2015

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An adequate understanding of the interface between optical fibers and geomaterials is a prerequisite for applying distributed optical fiber sensor systems to strain monitoring in geoengineering. This contribution reports a quantitative investigation of the fiber/soil interfacial behavior regarding the influence of fiber types and normal pressures. A simplified model describing the progressive failure of a fiber/soil interface was briefly illustrated. Results of a series of pullout tests on three different soil-embedded optical fibers under various normal pressures were interpreted by this model, through which the fiber/soil interfacial behaviors were quantified. The results showed that the mechanical properties of the three fiber/soil interfaces were similar. Optical microscopic images indicated that the soil particles and the fibers were merely loosely contacted. This led to the formation of a fiber/soil interface susceptible to the normal pressure: 1) the interfacial bond was tightened and 2) the deformation measurement range was widened under high normal pressures. Moreover, the criterion for selecting a strain sensing fiber for geoengineering applications was discussed in terms of interfacial bond, deformation measurement range, ratio of peak to residual interfacial shear strength, Young's modulus of fiber, and so forth. An assessment of the three fibers reveals that, for ground deformation measurement, each fiber has its own advantages as well as limitations. In field or laboratory applications, a combination of different types of fibers may obtain the best measurement results.

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confidence: 99%

Quantitative Evaluation of Optical Fiber/Soil Interfacial Behavior and Its Implications for Sensing Fiber Selection

et al. 2015

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“…As can be seen in Eq. (16), the strain correction factor k is dominated by geometrical and mechanical parameters of all components of surface-bonded FBG. Both precise theoretical strain correction factor k and exactly measured characteristic parameters are crucial to achieve high correction accuracy.…”

Section: Numerical Investigation For the Strain Correction Factormentioning

confidence: 99%

“…The accuracy and sensitivity of a directly bonded FBG strain sensor mainly depends on various specific factors of each surface-bonded FBG, including the bonding length [10], recoating and adhesive materials [11,12], packing method [13][14][15] and even position of the FBG relative to the adhesive center [16]. The problem, known as "strain transfer", has been extensively studied for both embedded and surface-bonded FBGs [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Measurement accuracy of FBG used as a surface-bonded strain sensor installed by adhesive

Xue

Fang

et al. 2018

Appl. Opt.

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Material and dimensional properties of surface-bonded fiber Bragg gratings (FBGs) can distort strain measurement, thereby lowering the measurement accuracy. To accurately assess measurement precision and correct obtained strain, a new model, considering reinforcement effects on adhesive and measured object, is proposed in this study, which is verified to be accurate enough by the numerical method. Meanwhile, a theoretical strain correction factor is obtained, which is demonstrated to be significantly sensitive to recoating material and bonding length, as suggested by numerical and experimental results. It is also concluded that a short grating length as well as a thin but large-area (preferably covering the whole FBG) adhesive can enhance the correction precision.

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“…A number of analytical and experimental studies, by various authors, focus on this problem [47,48,49,50,51,52,53]. A model proposed to estimate the effects of shear lag in the limit where the elastic moduli of fiber coating and adhesive (acrylate glue) are negligible (only the shear moduli for these are considered) estimates the strain transfer coefficient K st as a function of the position along the fiber:

K_{s t} = \frac{ε_{f} (x)}{ε_{s}} = \frac{1 - c o s h (k_{2} x) / c o s h (k_{2} l / 2)}{k_{1}};

where

k_{1} = 1 + \frac{π r_{f}^{2}}{2 h r_{p}} \frac{E_{f}}{E_{s}};

and

k_{2} = \sqrt{k_{1} \cdot \frac{2 r_{p}}{π r_{f}^{2} E_{f}} \cdot \int_{0}^{\frac{π}{2}} {[\frac{r_{p} (1 - \sin θ)}{G_{a}} + \frac{r_{p}}{G_{p}} l n (\frac{r_{p}}{r_{f}})]}^{- 1} d θ}

…”

Section: Experimental Challenges Artifacts and Strategies Used Tmentioning

confidence: 99%

Fiber Bragg Grating Dilatometry in Extreme Magnetic Field and Cryogenic Conditions

Jaime

Moya

Weickert

et al. 2017

Sensors

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In this work, we review single mode SiO2 fiber Bragg grating techniques for dilatometry studies of small single-crystalline samples in the extreme environments of very high, continuous, and pulsed magnetic fields of up to 150 T and at cryogenic temperatures down to <1 K. Distinct millimeter-long materials are measured as part of the technique development, including metallic, insulating, and radioactive compounds. Experimental strategies are discussed for the observation and analysis of the related thermal expansion and magnetostriction of materials, which can achieve a strain sensitivity (ΔL/L) as low as a few parts in one hundred million (≈10−8). The impact of experimental artifacts, such as those originating in the temperature dependence of the fiber’s index of diffraction, light polarization rotation in magnetic fields, and reduced strain transfer from millimeter-long specimens, is analyzed quantitatively using analytic models available in the literature. We compare the experimental results with model predictions in the small-sample limit, and discuss the uncovered discrepancies.

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Quantitative Sensitivity Analysis of Surface Attached Optical Fiber Strain Sensor

Cited by 20 publications

References 37 publications

Quantitative Evaluation of Optical Fiber/Soil Interfacial Behavior and Its Implications for Sensing Fiber Selection

Quantitative Evaluation of Optical Fiber/Soil Interfacial Behavior and Its Implications for Sensing Fiber Selection

Measurement accuracy of FBG used as a surface-bonded strain sensor installed by adhesive

Fiber Bragg Grating Dilatometry in Extreme Magnetic Field and Cryogenic Conditions

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