Arbitrary strain profile measurement within fibre gratings using interferometric Fourier transform technique

Ohn, Myo Myint; Huang, Shan; Measures, Raymond M.; Chwang, Jerry J. S.

doi:10.1049/el:19970850

Cited by 32 publications

(29 citation statements)

References 5 publications

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“…That is to say, we need a two-step inversion process for our damage reconstruction: the reflection intensity spectra of FBGs-strain profiles of gratingsand the location and geometry of a defect. In the second strategy, however, the strain profiles of FBGs play the role of intermediate functions that influence the reflection intensity spectra according to equations (12) and (13), and thus only a one-step inversion study is required, saving much computation time. In fact, the two strategies give almost the same solution, as illustrated in section 5.…”

Section: Photo-elasticmentioning

confidence: 99%

Reconstruction of structural damage based on reflection intensity spectra of fiber Bragg gratings

Huang¹,

Wei²,

Chen³

et al. 2014

Meas. Sci. Technol.

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We present an approach for structural damage reconstruction based on the reflection intensity spectra of fiber Bragg gratings (FBGs). Our approach incorporates the finite element method, transfer matrix (T-matrix), and genetic algorithm to solve the inverse photo-elastic problem of damage reconstruction, i.e. to identify the location, size, and shape of a defect. By introducing a parameterized characterization of the damage information, the inverse photo-elastic problem is reduced to an optimization problem, and a relevant computational scheme was developed. The scheme iteratively searches for the solution to the corresponding direct photo-elastic problem until the simulated and measured (or target) reflection intensity spectra of the FBGs near the defect coincide within a prescribed error. Proof-of-concept validations of our approach were performed numerically and experimentally using both holed and cracked plate samples as typical cases of plane-stress problems. The damage identifiability was simulated by changing the deployment of the FBG sensors, including the total number of sensors and their distance to the defect. Both the numerical and experimental results demonstrate that our approach is effective and promising. It provides us with a photo-elastic method for developing a remote, automatic damage-imaging technique that substantially improves damage identification for structural health monitoring.

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Section: Photo-elasticmentioning

confidence: 99%

Reconstruction of structural damage based on reflection intensity spectra of fiber Bragg gratings

Huang¹,

Wei²,

Chen³

et al. 2014

Meas. Sci. Technol.

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“…Thus, it is important to develop a simple system to measure the spectrum. Many wavelength-detection techniques for fiber grating sensors have been proposed such as Matched-filter interrogation technique [4], Fourier transform technique [5], tunable filters technique [6], interferometric techniques [7].…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain sensor based on weak LPG and fiber ring down

Liu

Luo

Kai

2007

Micro & Optical Tech Letters

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“…The complex coupling coefficient contains information about the refractive index modulation and the local grating period along the grating length. The possibility to monitor changes in local FBG parameters opened new possibilities for high spatial resolution grating characterization and distributed sensing [4,[7][8][9][10]. The complete characterization and sensing applications of the FBG using high-resolution reflectometry methods were mostly limited so far to nonbirefingent gratings.…”

Section: Introductionmentioning

confidence: 99%

Distributed measurements of fiber birefringence and diametric load using optical low-coherence reflectometry and fiber gratings

Ćorić¹,

Limberger²,

Salathé³

2006

Opt. Express

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Polarization sensitive optical low-coherence reflectometry (OLCR) is used for measuring the complex fiber Bragg gratings (FBG) reflection coefficient. We determine the beat length directly from oscillations in the OLCR amplitude with a resolution of 10 -6 and a spatial resolution only limited by the minimum beat length or the coherence length of the light source. Using the OLCR amplitude and phase in combination with an inverse scattering algorithm the birefringence is retrieved with a resolution of 2×10 -5 while the spatial resolution is 25 μm. The two developed techniques are applied for measuring position, magnitude and footprint of induced birefringence of an FBG under uniform and nonuniform diametric loading.

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Arbitrary strain profile measurement within fibre gratings using interferometric Fourier transform technique

Cited by 32 publications

References 5 publications

Reconstruction of structural damage based on reflection intensity spectra of fiber Bragg gratings

Reconstruction of structural damage based on reflection intensity spectra of fiber Bragg gratings

Temperature and strain sensor based on weak LPG and fiber ring down

Distributed measurements of fiber birefringence and diametric load using optical low-coherence reflectometry and fiber gratings

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