Advanced fiber-optic acoustic sensors

Teixeira, João G. V.; Leite, Ivo T.; Silva, Susana; Frazão, Orlando

doi:10.1007/s13320-014-0148-5

Cited by 81 publications

(28 citation statements)

References 52 publications

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“…Attempts to develop practical AE sensors based on optical fibers have continued [163,164], but cost and directionality problems still are obstacles. Yu et al [165] presented a novel use of a fiber Bragg grating (FBG) sensor, a version that relies on phase shifts.…”

Section: Sensing and Signal Processingmentioning

confidence: 99%

Review on Structural Health Evaluation with Acoustic Emission

Ono

2018

Applied Sciences

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This review introduces several areas of importance in acoustic emission (AE) technology, starting from signal attenuation. Signal loss is a critical issue in any large-scale AE monitoring, but few systematic studies have appeared. Information on damping and attenuation has been gathered from metal, polymer, and composite fields to provide a useful method for AE monitoring. This is followed by discussion on source location, bridge monitoring, sensing and signal processing, and pressure vessels and tanks, then special applications are briefly covered. Here, useful information and valuable sources are identified with short comments indicating their significance. It is hoped that readers note developments in areas outside of their own specialty for possible cross-fertilization.

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Section: Sensing and Signal Processingmentioning

confidence: 99%

Review on Structural Health Evaluation with Acoustic Emission

Ono

2018

Applied Sciences

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“…The SPP excited by this configuration is used in an experiment that reveals the potential of the technique in terms of absolute refractometric sensitivity in dilute gases. Here we rely on acoustically induced refractive index change sensing, as the latter requires an ultrahigh measurement resolution3031. We demonstrate that the SPP-matched resonances can detect an acoustic wave moving across the fibre grating.…”

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confidence: 99%

Ultrasensitive plasmonic sensing in air using optical fibre spectral combs

et al. 2016

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Surface plasmon polaritons (SPP) can be excited on metal-coated optical fibres, enabling the accurate monitoring of refractive index changes. Configurations reported so far mainly operate in liquids but not in air because of a mismatch between permittivities of guided light modes and the surrounding medium. Here we demonstrate a plasmonic optical fibre platform that overcomes this limitation. The underpinning of our work is a grating architecture—a gold-coated highly tilted Bragg grating—that excites a spectral comb of narrowband-cladding modes with effective indices near 1.0 and below. Using conventional spectral interrogation, we measure shifts of the SPP-matched resonances in response to static atmospheric pressure changes. A dynamic experiment conducted using a laser lined-up with an SPP-matched resonance demonstrates the ability to detect an acoustic wave with a resolution of 10−8 refractive index unit (RIU). We believe that this configuration opens research directions for highly sensitive plasmonic sensing in gas.

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“…The structure is illuminated with a supercontinuum source, and the reflected spectral response is measured with an optical spectrum analyser. The sensing and reference interferometers are FPIs, which can be fabricated using different methods [15][16][17][18] . In this work, the FPIs consist of a hollow capillary tube spliced between standard telecommunication single-mode fibres (further details in "Methods").…”

Section: Resultsmentioning

confidence: 99%

Giant refractometric sensitivity by combining extreme optical Vernier effect and modal interference

Gomes

Kobelke

Bierlich

et al. 2020

Sci Rep

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The optical Vernier effect consists of overlapping responses of a sensing and a reference interferometer with slightly shifted interferometric frequencies. The beating modulation thus generated presents high magnified sensitivity and resolution compared to the sensing interferometer, if the two interferometers are slightly out of tune with each other. However, the outcome of such a condition is a large beating modulation, immeasurable by conventional detection systems due to practical limitations of the usable spectral range. We propose a method to surpass this limitation by using a few-mode sensing interferometer instead of a single-mode one. The overlap response of the different modes produces a measurable envelope, whilst preserving an extremely high magnification factor, an order of magnification higher than current state-of-the-art performances. Furthermore, we demonstrate the application of that method in the development of a giant sensitivity fibre refractometer with a sensitivity of around 500 µm/RIU (refractive index unit) and with a magnification factor over 850.

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Advanced fiber-optic acoustic sensors

Cited by 81 publications

References 52 publications

Review on Structural Health Evaluation with Acoustic Emission

Review on Structural Health Evaluation with Acoustic Emission

Ultrasensitive plasmonic sensing in air using optical fibre spectral combs

Giant refractometric sensitivity by combining extreme optical Vernier effect and modal interference

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