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Guided wave and damage detection in composite laminates using different fiber optic sensors.

Li F, Murayama H, Kageyama K, Shirai T - Sensors (Basel) (2009)

Bottom Line: Characteristics of these fiber optic sensors in ultrasonic guided wave detection were systematically compared.The signal-to-noise ratio (SNR) of guided wave signal captured by an FOD sensor is relatively high in comparison with that of the FBG sensor because of their different physical principles in ultrasonic detection.Further, the FOD sensor is sensitive to the damage-induced fundamental shear horizontal (SH(0)) guided wave that, however, cannot be detected by using the FBG sensor, because the FOD sensor is omnidirectional in ultrasound detection and, in contrast, the FBG sensor is severely direction dependent.

View Article: PubMed Central - PubMed

Affiliation: Department of Systems Innovation, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

ABSTRACT
Guided wave detection using different fiber optic sensors and their applications in damage detection for composite laminates were systematically investigated and compared in this paper. Two types of fiber optic sensors, namely fiber Bragg gratings (FBG) and Doppler effect-based fiber optic (FOD) sensors, were addressed and guided wave detection systems were constructed for both types. Guided waves generated by a piezoelectric transducer were propagated through a quasi-isotropic carbon fiber reinforced plastic (CFRP) laminate and acquired by these fiber optic sensors. Characteristics of these fiber optic sensors in ultrasonic guided wave detection were systematically compared. Results demonstrated that both the FBG and FOD sensors can be applied in guided wave and damage detection for the CFRP laminates. The signal-to-noise ratio (SNR) of guided wave signal captured by an FOD sensor is relatively high in comparison with that of the FBG sensor because of their different physical principles in ultrasonic detection. Further, the FOD sensor is sensitive to the damage-induced fundamental shear horizontal (SH(0)) guided wave that, however, cannot be detected by using the FBG sensor, because the FOD sensor is omnidirectional in ultrasound detection and, in contrast, the FBG sensor is severely direction dependent.

No MeSH data available.


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Guided wave and damage detection system using piezoelectric actuator and FBG.
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f1-sensors-09-04005: Guided wave and damage detection system using piezoelectric actuator and FBG.

Mentions: A tunable laser source was used in the present study for guided wave detection. As shown in Figure 1, a PXI-6115 (National Instruments Co., USA) simultaneously functions as an incident wave generator and wave acquisition device. The generated incident wave was amplified by a Piezo-Amplifier (M-2643, MESS-TEK Co., Japan) and was emitted into the specimen by a PRYY-0929 PZT actuator (Physik Instrumente GmbH & Co. KG, Germany) to excite Lamb guided waves. FBG receives guided waves as the strain change of the laminate depending on time and, therefore, center the wavelength of the reflected light from the FBG changes. The wavelength shift is detected using the high speed optical wavelength interrogation system. Finally, the PXI-6115 acquires guided waves filtered by the filter FV-628B (NF Corporation, Japan). FBGs (Fujikura Ltd., Japan, gauge length: 3 mm, wavelength: circa 1,550 nm, full width at half maximum (FWHM): circa 0.5 nm, and reflectivity: > 90%) were used in the present study.


Guided wave and damage detection in composite laminates using different fiber optic sensors.

Li F, Murayama H, Kageyama K, Shirai T - Sensors (Basel) (2009)

Guided wave and damage detection system using piezoelectric actuator and FBG.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3297139&req=5

f1-sensors-09-04005: Guided wave and damage detection system using piezoelectric actuator and FBG.
Mentions: A tunable laser source was used in the present study for guided wave detection. As shown in Figure 1, a PXI-6115 (National Instruments Co., USA) simultaneously functions as an incident wave generator and wave acquisition device. The generated incident wave was amplified by a Piezo-Amplifier (M-2643, MESS-TEK Co., Japan) and was emitted into the specimen by a PRYY-0929 PZT actuator (Physik Instrumente GmbH & Co. KG, Germany) to excite Lamb guided waves. FBG receives guided waves as the strain change of the laminate depending on time and, therefore, center the wavelength of the reflected light from the FBG changes. The wavelength shift is detected using the high speed optical wavelength interrogation system. Finally, the PXI-6115 acquires guided waves filtered by the filter FV-628B (NF Corporation, Japan). FBGs (Fujikura Ltd., Japan, gauge length: 3 mm, wavelength: circa 1,550 nm, full width at half maximum (FWHM): circa 0.5 nm, and reflectivity: > 90%) were used in the present study.

Bottom Line: Characteristics of these fiber optic sensors in ultrasonic guided wave detection were systematically compared.The signal-to-noise ratio (SNR) of guided wave signal captured by an FOD sensor is relatively high in comparison with that of the FBG sensor because of their different physical principles in ultrasonic detection.Further, the FOD sensor is sensitive to the damage-induced fundamental shear horizontal (SH(0)) guided wave that, however, cannot be detected by using the FBG sensor, because the FOD sensor is omnidirectional in ultrasound detection and, in contrast, the FBG sensor is severely direction dependent.

View Article: PubMed Central - PubMed

Affiliation: Department of Systems Innovation, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

ABSTRACT
Guided wave detection using different fiber optic sensors and their applications in damage detection for composite laminates were systematically investigated and compared in this paper. Two types of fiber optic sensors, namely fiber Bragg gratings (FBG) and Doppler effect-based fiber optic (FOD) sensors, were addressed and guided wave detection systems were constructed for both types. Guided waves generated by a piezoelectric transducer were propagated through a quasi-isotropic carbon fiber reinforced plastic (CFRP) laminate and acquired by these fiber optic sensors. Characteristics of these fiber optic sensors in ultrasonic guided wave detection were systematically compared. Results demonstrated that both the FBG and FOD sensors can be applied in guided wave and damage detection for the CFRP laminates. The signal-to-noise ratio (SNR) of guided wave signal captured by an FOD sensor is relatively high in comparison with that of the FBG sensor because of their different physical principles in ultrasonic detection. Further, the FOD sensor is sensitive to the damage-induced fundamental shear horizontal (SH(0)) guided wave that, however, cannot be detected by using the FBG sensor, because the FOD sensor is omnidirectional in ultrasound detection and, in contrast, the FBG sensor is severely direction dependent.

No MeSH data available.


Related in: MedlinePlus