Evaluation of debonding progress in composite bonded structures using ultrasonic waves received in fiber Bragg grating sensors

Okabe, Yoji; Kuwahara, Junichiro; Natori, Kazuki; Takeda, Nobuo; Ogisu, Toshimichi; Kojima, Seiji; Komatsuzaki, Shinji

doi:10.1088/0964-1726/16/4/051

Cited by 36 publications

(20 citation statements)

References 15 publications

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“…In order to confirm the high resolution of our novel PS-FBG system, the results were compared with that of previous FBG and AWG system (Okabe et al, 2007). Figure 7(a) and (b) shows the waveforms of the received signal from the PS-FBG and FBG sensors.…”

Section: Comparison Between Two Kinds Of Systemmentioning

confidence: 96%

Novel real-time acousto-ultrasonic sensors using two phase-shifted fiber Bragg gratings

Okabe

2013

Journal of Intelligent Material Systems and Structures

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A novel real-time acousto-ultrasonic sensor system using a phase-shifted fiber Bragg grating rather than a normal fiber Bragg grating was investigated. The spectrum of the phase-shifted fiber Bragg grating was simulated and analyzed, which indicates that a phase-shifted fiber Bragg grating has superior properties when compared to a normal fiber Bragg grating. Based on theoretical considerations, a novel real-time acousto-ultrasonic sensor system was proposed. Two identical 5mm phase-shifted fiber Bragg gratings, with slightly different Bragg wavelengths, were used as the filter and the sensor. An amplified spontaneous emission light source and an apodized fiber Bragg grating were connected to illuminate the phase-shifted fiber Bragg gratings. The design allows the strain resulting from the ultrasonic wave to be precisely received and converted to the fluctuation of the output voltage. An ultrasonic wave generated in a carbon fiberreinforced plastic plate using a macrofiber composite actuator was detected by both the phase-shifted fiber Bragg grating sensor system and a sensor system based on a normal fiber Bragg grating and arrayed waveguide grating. Comparison of the temporal and spectral responses of these two systems indicates that the phase-shifted fiber Bragg grating sensor system has a higher sensitivity than the fiber Bragg grating system. The results show that the phase-shifted fiber Bragg grating system does not require data averaging for noise reduction to measure the Lamb wave modes in a carbon fiberreinforced plastic plate.

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Section: Comparison Between Two Kinds Of Systemmentioning

confidence: 96%

Novel real-time acousto-ultrasonic sensors using two phase-shifted fiber Bragg gratings

Okabe

2013

Journal of Intelligent Material Systems and Structures

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“…Takeda et al used a small-diameter FBG to detect the signal and to quantitatively evaluate the debonding process in a CFRP double-lap type coupon specimen according to the arrival time delay of the wave [ 27 ]. The same method was also used for a skin/stringer structure of an airplane, and a new damage index was proposed to evaluate the size of the debonded area [ 119 ]. Figure 12 c,d are the corresponding wavelet transform results of wave in Figure 12 a,b.…”

Section: Fbg In Ultrasonic Structural Health Monitoringmentioning

confidence: 99%

Ultrasonic Structural Health Monitoring Using Fiber Bragg Grating

Okabe

2018

Sensors

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The fiber Bragg grating (FBG) sensor, which was developed over recent decades, has been widely used to measure manifold static measurands in a variety of industrial sectors. Multiple experiments have demonstrated its ability in ultrasonic detection and its potential in ultrasonic structural health monitoring. Unlike static measurements, ultrasonic detection requires a higher sensitivity and broader bandwidth to ensure the fidelity of the ultrasonic Lamb wave that propagates in a plate-like structure for the subsequent waveform analysis. Thus, the FBG sensor head and its corresponding demodulation system need to be carefully designed, and other practical issues, such as the installation methods and data process methods, should also be properly addressed. In this review, the mature techniques of FBG-based ultrasonic sensors and their practical applications in ultrasonic structural health monitoring are discussed. In addition, state-of-the-art techniques are introduced to fully present the current developments.

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“…The debonding progress can be evaluated quantitively through the continuous wavelet transform of the received waveforms. The detail of the ultrasonic test for debonding detection and its further application to a skin/stringer structural element of airplanes were described in 27 .…”

Section: Fbg-based Ultrasonic Non-destructive Testing For Damage Idenmentioning

confidence: 99%

Lamb wave-based damage detection of composite shells using high-speed fiber-optic sensing

et al. 2014

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A Lamb wave-based damage identification method called damage imaging method for composite shells is presented. A damage index (DI) is generated from the delay matrix of the Lamb wave response signals, and it is used to indicate the location and approximate area of the damage. A piezoelectric actuator is employed to generate the Lamb waves that are subsequently captured by a fiber Bragg grating (FBG) sensor element array multiplexed in a single fiber connected to a high-speed fiber-optic sensor system. The high-speed sensing is enabled by an innovative parallel-architecture optical interrogation system. The viability of this method is demonstrated by analyzing the numerical and experimental Lamb wave response signals from laminated composite shells. The technique only requires the response signals from the plate after damage, and it is capable of performing near real-time damage identification. This study sheds some light on the application of a Lamb wave-based damage detection algorithm for curved plate/shell-type structures by using the relatively low frequency (around 100 kHz) Lamb wave response and the high-speed FBG sensor system.

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Evaluation of debonding progress in composite bonded structures using ultrasonic waves received in fiber Bragg grating sensors

Cited by 36 publications

References 15 publications

Novel real-time acousto-ultrasonic sensors using two phase-shifted fiber Bragg gratings

Novel real-time acousto-ultrasonic sensors using two phase-shifted fiber Bragg gratings

Ultrasonic Structural Health Monitoring Using Fiber Bragg Grating

Lamb wave-based damage detection of composite shells using high-speed fiber-optic sensing

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