@inproceedings{2c791b2f4b3c41a18f1732ea24ab4b2c,
title = "Photoacoustic microscopic imaging of surface and subsurface damages in CFRP",
abstract = "Photoacoustic imaging comprises an optical excitation within a target zone and the detection of the ultrasonic wave so created. A pulsed laser illuminates the target zone, and this illumination causes rapid thermoelastic expansion that generates a broadband high-frequency ultrasonic wave (photoacoustic wave, PA). In this paper, we report proof-of-concept experiments for nondestructive testing of laminar materials using a PA microscope. A specimen containing carbon-fiber-reinforced plastic (CFRP) was used in this experiment and involved an artificial delamination. A 532-nm-wavelength laser irradiates the top surface of the specimen, and the resulting ultrasonic waves are received by a point-focusing immersion transducer on the same side. Our system estimated the depth and dimension of the subsurface delamination accurately. By coating a light-absorbing material on the surface, the amplitude of the PA wave increased. This finding shows that the signal-noise (S/N) ratio of the scattered wave from delaminations can be improved with the surface coatings.",
author = "Kazuyuki Nakahata and Keiji Ogi and Takeshi Namita and Katsumi Ohira and Masayuki Maruyama and Tsuyoshi Shiina",
note = "Funding Information: This study was funded by ImPACT Program (Project manager: Takayuki Yagi) of the Council for Science, Technology and Innovation (Cabinet Office, Government of Japan). Publisher Copyright: {\textcopyright} 2018 Author(s).; 44th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2017 ; Conference date: 16-07-2017 Through 21-07-2017",
year = "2018",
month = apr,
day = "20",
doi = "10.1063/1.5031633",
language = "English",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
editor = "Chimenti, {Dale E.} and Bond, {Leonard J.}",
booktitle = "44th Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 37",
}