Fiber-Optic Strain Sensor System With Temperature Compensation for Arch Bridge Condition Monitoring

Mokhtar, M.R.; Owens, Kieran; Kwasny, Jacek; Taylor, Su; Basheer, Pam; Cleland, David; Bai, Ya; Sonebi, Mohamed; Davis, G. M.; Gupta, Abhey; Hogg, I.; Bell, Brian; Doherty, William O.S.; McKeague, S.; Moore, David F.; Greeves, K; Sun, Tao; Grattan, K. T. V.

doi:10.1109/jsen.2011.2172991

Cited by 39 publications

(21 citation statements)

References 14 publications

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“…Due to Hooke’s law, under the range of elastic deformation, strain is linearly related to stress, and the relationship can be expressed as:

ε_{i} = \sum_{j = 1}^{6} h_{i j} δ_{j} (i, j = x x, y y, z z, y z, z x, x y),

where each coefficient, according to the symmetry of coordinate axis, has an inner connection as

h_{i j} = h_{j i}

instead of being absolutely independent. However, in most of the practical instances in which the optical fiber may be affected by mechanical stress, the fiber is commonly placed or embedded in building walls, bridges, concrete, or some other enclosed structure, being used as a sensitive component to realize the measurement of strain or stress [37,38]. Under this condition, because of the special properties and characterizations of these enclosed structures, the shear deformation can be ignored and only the longitudinal stress is concerned (

σ_{x} = σ_{y} = 0

), so that the relationship between strain and stress can be simplified into [39]:

(\begin{matrix} left \\ ε_{x} \\ ε_{y} \\ ε_{z} \end{matrix}) = \frac{F}{A Y} (\begin{matrix} 1 & - υ & - υ \\ - υ & 1 & - υ \\ 1 & - υ & - υ \end{matrix}) (\begin{matrix} 0 \\ 0 \\ 1 \end{matrix}) = \frac{F}{A Y} (\begin{matrix} - υ \\ - υ \\ 1 \end{matrix}) .

…”

Section: Theoretical Basis and Sensing Principlementioning

confidence: 99%

High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay

Yang

Fan

et al. 2017

Sensors

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A fiber-optic delay based strain sensor with high precision and temperature insensitivity was reported, which works on detecting the delay induced by strain instead of spectrum. In order to analyze the working principle of this sensor, the elastic property of fiber-optic delay was theoretically researched and the elastic coefficient was measured as 3.78 ps/km·με. In this sensor, an extra reference path was introduced to simplify the measurement of delay and resist the cross-effect of environmental temperature. Utilizing an optical fiber stretcher driven by piezoelectric ceramics, the performance of this strain sensor was tested. The experimental results demonstrate that temperature fluctuations contribute little to the strain error and that the calculated strain sensitivity is as high as 4.75 με in the range of 350 με. As a result, this strain sensor is proved to be feasible and practical, which is appropriate for strain measurement in a simple and economical way. Furthermore, on basis of this sensor, the quasi-distributed measurement could be also easily realized by wavelength division multiplexing and wavelength addressing for long-distance structure health and security monitoring.

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“…Due to Hooke’s law, under the range of elastic deformation, strain is linearly related to stress, and the relationship can be expressed as:

ε_{i} = \sum_{j = 1}^{6} h_{i j} δ_{j} (i, j = x x, y y, z z, y z, z x, x y),

where each coefficient, according to the symmetry of coordinate axis, has an inner connection as

h_{i j} = h_{j i}

σ_{x} = σ_{y} = 0

), so that the relationship between strain and stress can be simplified into [39]:

(\begin{matrix} left \\ ε_{x} \\ ε_{y} \\ ε_{z} \end{matrix}) = \frac{F}{A Y} (\begin{matrix} 1 & - υ & - υ \\ - υ & 1 & - υ \\ 1 & - υ & - υ \end{matrix}) (\begin{matrix} 0 \\ 0 \\ 1 \end{matrix}) = \frac{F}{A Y} (\begin{matrix} - υ \\ - υ \\ 1 \end{matrix}) .

…”

Section: Theoretical Basis and Sensing Principlementioning

confidence: 99%

High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay

Yang

Fan

et al. 2017

Sensors

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“…The measurements are undertaken at a room temperature, mirroring the typically steady temperature of the local marine environment. However a correction for any temperature changes can readily be added -a further set of FBGs configured to be sensitive only to temperature is used, so that the acoustic signal only is determined [31][32]. Fig.…”

Section: Acoustic Emission Detection Using Half-lifting Surface Plmentioning

confidence: 99%

Fibre Bragg Grating-Based Acoustic Sensor Array for Improved Condition Monitoring of Marine Lifting Surfaces

Vidakovic

Armakolas

Sun

et al. 2016

J. Lightwave Technol.

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“…When the optical fibre strain sensor is attached on the plate along the longitudinal direction and with distance b from the center of the circular hole (Fig. 6), the polar coordinates of the optical fibre can be calculated by Equation 21. With considering the Poisson's effect, the longitudinal strain field along the optical fibre is given by Equation 22.…”

Section: B Uniform and Nonuniform Strain Fieldmentioning

confidence: 99%

“…Optical fibre strain sensors are commonly attached on the surface of structure similar to resistive strain gauges [20], [21]. In principle, with adequate sampling and signal processing techniques, the accuracy of optical fibre strain sensor is better than electrical counterparts.…”

Section: Introductionmentioning

confidence: 99%

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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Fiber-Optic Strain Sensor System With Temperature Compensation for Arch Bridge Condition Monitoring

Cited by 39 publications

References 14 publications

High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay

High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay

Fibre Bragg Grating-Based Acoustic Sensor Array for Improved Condition Monitoring of Marine Lifting Surfaces

Quantitative Sensitivity Analysis of Surface Attached Optical Fiber Strain Sensor

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