Measurement of arbitrary strain profiles withinfibre gratings

Volanthen, M.; Geiger, H.; Cole, M.J.; Dakin, J.P.

doi:10.1049/el:19960678

Cited by 33 publications

(21 citation statements)

References 2 publications

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“…Intragrating sensing, on the other hand, is the process of obtaining a continuous profile of strain or temperature within a single fiber Bragg grating (FBG) [2][3][4]. This can be accomplished by applying appropriate transforms to complex phase and amplitude spectra through the use of specialized equipment [5][6].…”

Section: Introductionmentioning

confidence: 99%

“…This can be accomplished by applying appropriate transforms to complex phase and amplitude spectra through the use of specialized equipment [5][6]. Techniques for intragrating sensing based on conventional FBGs have had varying degree of success [2][3][4]. One way to overcome problems associated with conventional FBGs is to use chirped fiber Bragg gratings (CFBGs).…”

Section: Introductionmentioning

confidence: 99%

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Localized strain measurements using an integration method to process intensity reflection spectra from a chirped FBG

Nand

Kitcher

Wade

et al. 2007

Third European Workshop on Optical Fibre Sensors

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A chirped fiber Bragg grating was used to measure the non-uniform strain profile of a notched aluminum specimen used to simulate a cracked structure. The specimen was subjected to tensile tests that produced regions of non-uniform strain near the notches. Analysis of power reflectance spectra from the grating, through the use of an integration method, enabled the strain profile near the notches to be determined. Unlike other intragrating sensing methods, this method did not require a disturbance hypothesis to be postulated. The strain profile results from this intragrating sensor were in reasonable agreement with predictions from modeling conducted using the finite element method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Localized strain measurements using an integration method to process intensity reflection spectra from a chirped FBG

Nand

Kitcher

Wade

et al. 2007

Third European Workshop on Optical Fibre Sensors

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show abstract

“…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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“…Techniques for intragrating sensing based on conventional FBGs have had varying degree of success [7][8][9][10][11] . One way to overcome problems associated with the use of conventional FBGs is to use a CFBG instead.…”

Section: Introductionmentioning

confidence: 99%

Temperature profile measurements within a chirped fiber Bragg grating using a Fourier transform technique

et al. 2005

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The use of reflected power spectra arising from a chirped fiber Bragg grating (CFBG) to extract a nonuniform temperature distribution along the grating has been investigated. The technique uses a discrete Fourier transform (FFT) in which the measured spectrum of the CFBG due to a localised temperature change was simulated using the FFT grating design model. The model operated on the reference spectrum and hypothesis temperature distributions, T(z), to generate a spectrum representative of a localised temperature disturbance. The simulated spectrum was fitted to the measured spectrum using a three-parameter disturbance function operating on position, width and amplitude of temperature change. The rms deviation of the applied value for position of a localised temperature change was 0.14 mm.

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Measurement of arbitrary strain profiles withinfibre gratings

Abstract: Rsults from the first measurement of an arbitrap jtmin field within a tibre Bngg gratin8 are presented. Lo\v coherence refleccromet~ has been used. together with a wavelen_mh-tunable rekrence-mating. to obtain strain qainst distance meajuremenrs.

Cited by 33 publications

References 2 publications

Localized strain measurements using an integration method to process intensity reflection spectra from a chirped FBG

Localized strain measurements using an integration method to process intensity reflection spectra from a chirped FBG

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

Temperature profile measurements within a chirped fiber Bragg grating using a Fourier transform technique

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