Lamb wave sensing using fiber Bragg grating sensors for delamination detection in composite laminates

Takeda, Nobuo; Okabe, Yoji; Kuwahara, Junichiro; Kojima, Seiji

doi:10.1117/12.598594

Cited by 9 publications

(8 citation statements)

References 5 publications

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“…If the degree of acceptable correlation between the input wave field and the FBG response is reduced to 95%, the threshold frequencies increase reducing the ratio requirement (z) to a factor of approximately 4.8 as shown on figure 7. These ratio metric values are within the same range as those predicted by other authors [11,12].…”

Section: Predicted Wavelength Response Limitssupporting

confidence: 90%

Reduced length fibre Bragg gratings for high frequency acoustic sensing

Davis¹,

Robertson²,

Brooks³

et al. 2014

Meas. Sci. Technol.

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In-fibre Bragg gratings (FBGs) are now well established for applications in acoustic sensing. The upper frequency response limit of the Bragg grating is determined by its gauge length, which has typically been limited to about 1 mm for commercially available Type 1 gratings. This paper investigates the effect of FBG gauge length on frequency response for sensing of acoustic waves. The investigation shows that the ratio of wavelength to FBG length must be at least 8.8 in order to reliably resolve the strain response without significant gain roll-off. Bragg gratings with a gauge length of 200 µm have been fabricated and their capacity to measure low amplitude high frequency acoustic strain fields in excess of 2 MHz is experimentally demonstrated. The ultimate goal of this work is to enhance the sensitivity of acoustic damage detection techniques by extending the frequency range over which acoustic waves may be reliably measured using FBGs.

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Section: Predicted Wavelength Response Limitssupporting

confidence: 90%

Reduced length fibre Bragg gratings for high frequency acoustic sensing

Davis¹,

Robertson²,

Brooks³

et al. 2014

Meas. Sci. Technol.

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“…Similar measurements using a Polytec heterodyne laser Doppler vibrometer as shown in Figure 5 also produce consistent results, confirming that the FBGs are able to uniquely identify the SH 0 mode. Takeda et al (2005b) has given in-depth and precise discussion on the directional sensitivity of the FBG sensors with respect to the angle of propagation by specific excitation of S 0 and A 0 modes. It is to be noted here that they only induce S 0 and A 0 modes in their test bed.…”

Section: Resultsmentioning

confidence: 99%

“…In an alternative method, a slope filter can be used to convert the wavelength-encoded reflection signal from the FBG sensor to amplitude-modulated signal that could be measured using standard high-sensitivity optical receivers. As proposed by Takeda et al (2005b), an arrayed waveguide grating (AWG) can be used to interrogate the sensor reflection and decode the vibration information. In this method, the SNR is determined by the slope of the filter used for interrogation and the range is limited.…”

Section: Our Approachmentioning

confidence: 99%

Detection of fundamental shear horizontal mode in plates using fibre Bragg gratings

Harish

Ray

Rajagopal

et al. 2016

Journal of Intelligent Material Systems and Structures

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Shear horizontal guided waves are attractive for structural health monitoring applications in view of the non-dispersive behaviour of the fundamental mode, possibly higher frequencies of operation and a less complex multi-modal structure. One of the key issues with the deployment of shear horizontal guided waves of modes for structural health monitoring applications is the general non-availability of techniques to sense this family of modes effectively. This article demonstrates the detection of fundamental shear horizontal waves in an aluminium plate by placing a fibre Bragg grating along a direction perpendicular to that of propagating guided elastic waves. In order to uniquely identify the three fundamental plate-guided modes, we map the experimentally measured group velocities as detected by the fibre Bragg grating to theoretically obtained group velocity dispersion curves. We find that the experimentally measured group velocity values using time-of-flight measurements from a perpendicularly placed fibre Bragg grating are in agreement with the theoretical curve for the [Formula: see text] mode. Possible extension of these results to feature-guided modes is also discussed.

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“…FBGs offer some advantages over piezoelectricity for this purpose, for instance the smaller size of the sensors and the directionality which offers the possibility of locate the sensors in such way that only waves in certain directions are detected. (Takeda et al, 2005).…”

Section: Fbgsmentioning

confidence: 99%

Damage detection in composite materials structures under variable loads conditions by using fiber Bragg gratings and principal component analysis, involving new unfolding and scaling methods

Sierra-Pérez

Güemes

Mujica

et al. 2014

Journal of Intelligent Material Systems and Structures

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An innovative methodology based on the use of fiber Bragg gratings as strain sensors and strain field pattern recognition is proposed for damage detection in composite materials structures. The strain field pattern recognition technique is based on principal component analysis. Damage indices (T 2 and Q) and detection thresholds are presented. New techniques for unfolding and scaling tridimensional matrices arrays obtained from structures working under variable load conditions are presented.Postprint (published version

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Lamb wave sensing using fiber Bragg grating sensors for delamination detection in composite laminates

Cited by 9 publications

References 5 publications

Reduced length fibre Bragg gratings for high frequency acoustic sensing

Reduced length fibre Bragg gratings for high frequency acoustic sensing

Detection of fundamental shear horizontal mode in plates using fibre Bragg gratings

Damage detection in composite materials structures under variable loads conditions by using fiber Bragg gratings and principal component analysis, involving new unfolding and scaling methods

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