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

Ćorić, Dragan; Limberger, H.G.; Salathé, R. P.

doi:10.1364/oe.14.011804

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…The main stake today in the field of fiber optics interferometry is the control of polarization. Some results related to this subject are to be published (Levy et al, 2006;Waagaard, 2006;Coric et al, 2006;Espejo et al, 2007). The set of feasible characterizations needs to be broadened and their precision needs to be improved.…”

Section: Resultsmentioning

confidence: 99%

Low Coherence Interferometry

Chapeleau

Leduc

Lupi

et al. 2013

Measurements Using Optic and RF Waves

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Resultsmentioning

confidence: 99%

Low Coherence Interferometry

Chapeleau

Leduc

Lupi

et al. 2013

Measurements Using Optic and RF Waves

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“…Despite these important findings, the OLCR-based method needs to be further improved in terms of the data acquisition speed (e.g. relatively fast crack growth) and in its use with polarization maintaining fibres or strain-induced polarization [18].…”

Section: Discussionmentioning

confidence: 99%

An experimental numerical study of the response of a long fibre Bragg grating sensor near a crack tip

Colpo¹,

Humbert²,

Botsis³

2007

Smart Mater. Struct.

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The use of fibre Bragg grating (FBG) sensors and the associated signal interrogation and analysis methods for structural monitoring and micro-mechanics is an important area of research. Long FBG sensors are very well suited for relatively non-invasive detection and measurements of complex strain distributions typically arising when cracks or delaminations are present. However, when the fibre is embedded in a non-homogeneous strain field, the interpretation of its response as a function of the position along the sensor is complicated. Thus, accurate strain data rely on the methods used to decode the wavelength changes and deduce the associated strain distribution. In this paper, the response of a 13 mm long FBG sensor embedded normal to the crack plane in a compact tension specimen of epoxy material is analysed. To introduce highly non-uniform strains along the fibre, a natural crack is grown by cyclic loads and two configurations are investigated: (a) when the fibre is ahead of the crack front, (b) when the fibre is behind the crack front. In both cases, analysis of the signals is carried out using the conventional T-matrix and a method based on optical low-coherence reflectometry (OLCR) and inverse scattering which provides a direct reconstruction of the axial strains in the fibre without any assumptions. The results of the measurements and analysis demonstrated that the predicted spectra from the T-matrix method are not in good agreement with the recorded ones. These differences are attributed to the high strain gradients along the fibre due to its proximity to the crack front. The results from the OLCR-based method directly provide the non-uniform strains along the fibre. The experimental measurements with the latter method are also in good agreement with a three-dimensional numerical model of the actual experimental configuration.

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“…The traditional basic way to achieve the reflectance spectrum is using the optical spectrum analyzer(OSA), but the higher resolution and accuracy OSA is quite expensive and cannot directly get the varied physics. However, nowadays the reflectometric techniques which include OLCR [2,3], optical frequency domain reflectometry(OFDR) [4,5]and optical time domain reflectometry(OTDR) [6] can successfully be used in FBGs detecting. And among them, the OLCR is the most popular and effective one.…”

Section: Introductionmentioning

confidence: 99%

Demodulation System of the FBG Reflectance Spectrum Based on Optical Low Coherence Reflectometry

Zhang¹,

Shen²,

Sun³

et al. 2015

Proceedings of the 2015 International Conference on Electrical, Automation and Mechanical Engineering

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Abstract-The key to the complex sensor detection(such as the non homogenous strain detection) of the fiber Bragg grating(FBG) is the demodulation of FBG reflectance spectrum. This paper designs the demodulation system which is based on the optical low coherence reflectometry(OLCR) princple. The system is mainly composed of the improved OLCR set-up and the LabVIEW demodulation program. The experimental results show that the demodulation system can effectively reduce the noise and amplify the interference signal, quickly demodulate the FBG reflectance spectrum and exactly find the Bragg wavelength after the zero padding and Gauss curve fitting, especially the repeatability can reach to 4pm.

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

Cited by 7 publications

References 28 publications

Low Coherence Interferometry

Low Coherence Interferometry

An experimental numerical study of the response of a long fibre Bragg grating sensor near a crack tip

Demodulation System of the FBG Reflectance Spectrum Based on Optical Low Coherence Reflectometry

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