TY - JOUR
T1 - Three dimensional imaging of subsurface delamination in carbon fiber reinforced plastic using photoacoustic wave method
AU - Nakahata, Kazuyuki
AU - Ogi, Keiji
AU - Mizukami, Koichi
AU - Ohira, Katsumi
AU - Maruyama, Masayuki
AU - Wada, Satoshi
AU - Namita, Takeshi
AU - Shiina, Tsuyoshi
N1 - Publisher Copyright:
© 2019 The Institute of Electrical Engineers of Japan.
PY - 2019
Y1 - 2019
N2 - Ultrasonic wave generated by interaction of the material with pulsed lasers is known to photoacoustic (PA) wave. In this study, the PA imaging is applied to the nondestructive testing for carbon fiber reinforced plastic (CFRP). When subsurface flaws are in CFRP, the detection of the flaws is sometimes challenging because the trailing signal from the surface interferes with the scattered signal from the flaws. Here we developed a PA microscopy (PAM) to reconstruct the location and the shape of the subsurface flaws. The PAM employs a confocal arrangement of optical and acoustic lens to maximize the intensity of generated PA waves. To enhance the lateral resolution of the image, we introduced the synthetic aperture focusing technique (SAFT). In the SAFT, it is necessary to consider direction-dependent group velocities due to the strong anisotropy in CFRP. The performance of the PA imaging combined with the SAFT was checked with artificial delaminations in a cross-ply CFRP specimen. It was shown that the PA wave had a wide frequency band and our method offered a high spatial resolution image.
AB - Ultrasonic wave generated by interaction of the material with pulsed lasers is known to photoacoustic (PA) wave. In this study, the PA imaging is applied to the nondestructive testing for carbon fiber reinforced plastic (CFRP). When subsurface flaws are in CFRP, the detection of the flaws is sometimes challenging because the trailing signal from the surface interferes with the scattered signal from the flaws. Here we developed a PA microscopy (PAM) to reconstruct the location and the shape of the subsurface flaws. The PAM employs a confocal arrangement of optical and acoustic lens to maximize the intensity of generated PA waves. To enhance the lateral resolution of the image, we introduced the synthetic aperture focusing technique (SAFT). In the SAFT, it is necessary to consider direction-dependent group velocities due to the strong anisotropy in CFRP. The performance of the PA imaging combined with the SAFT was checked with artificial delaminations in a cross-ply CFRP specimen. It was shown that the PA wave had a wide frequency band and our method offered a high spatial resolution image.
KW - Acoustic anisotropy
KW - Carbon fiber reinforced plastic (CFRP)
KW - Nondestructive testing
KW - Optical property
KW - Photo acoustic imaging
KW - Synthetic aperture focusing technique (SAFT)
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U2 - 10.1541/ieejeiss.139.142
DO - 10.1541/ieejeiss.139.142
M3 - Article
AN - SCOPUS:85061577521
VL - 139
SP - 142
EP - 148
JO - IEEJ Transactions on Electronics, Information and Systems
JF - IEEJ Transactions on Electronics, Information and Systems
SN - 0385-4221
IS - 2
ER -