Laser Wavelengths Suitable for Generating Ultrasonic Waves in Resin-Coated Carbon Fiber CompositesSource: Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems:;2020:;volume( 003 ):;issue: 003Author:Saito, Osamu
,
Sen, Enhi
,
Okabe, Yoji
,
Higuchi, Nobuhiro
,
Ishizuki, Hideki
,
Taira, Takunori
DOI: 10.1115/1.4046719Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: For the non-destructive inspection of carbon fiber-reinforced plastic (CFRP), lasers can be used to generate ultrasonic waves. It is important to optimize the wavelength of the laser to ensure the intense excitation of a usable propagating mode. Real CFRP components used in the construction of airplanes and automobiles are often coated with several types of resin to protect against weathering. These resin layers change the excitation of the ultrasonic waves. Thus, the optimum laser wavelength may be changed by the coating resin. In this paper, we investigated the excitation of ultrasonic waves in a resin-coated CFRP plate using different laser wavelengths. We conducted experiments to convert the laser wavelength using periodically poled LiNbO3 (PPLN) devices. By injecting mid-infrared laser to a coated sample, we observed excited ultrasonic waves using a laser Doppler vibrometer. We found that transparent resins significantly increase the amplitude of the first-arriving longitudinal wave. Furthermore, when the laser was strongly absorbed in the surface layer, the excitation of longitudinal waves was suppressed. These results were clarified by a one-dimensional model of the thermal generation of ultrasonic waves. We concluded that a laser passing through a resin layer is a viable candidate for the effective inspection of coated CFRP by laser ultrasonic waves.
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contributor author | Saito, Osamu | |
contributor author | Sen, Enhi | |
contributor author | Okabe, Yoji | |
contributor author | Higuchi, Nobuhiro | |
contributor author | Ishizuki, Hideki | |
contributor author | Taira, Takunori | |
date accessioned | 2022-02-04T14:33:48Z | |
date available | 2022-02-04T14:33:48Z | |
date copyright | 2020/04/08/ | |
date issued | 2020 | |
identifier issn | 2572-3901 | |
identifier other | nde_3_3_031103.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4273919 | |
description abstract | For the non-destructive inspection of carbon fiber-reinforced plastic (CFRP), lasers can be used to generate ultrasonic waves. It is important to optimize the wavelength of the laser to ensure the intense excitation of a usable propagating mode. Real CFRP components used in the construction of airplanes and automobiles are often coated with several types of resin to protect against weathering. These resin layers change the excitation of the ultrasonic waves. Thus, the optimum laser wavelength may be changed by the coating resin. In this paper, we investigated the excitation of ultrasonic waves in a resin-coated CFRP plate using different laser wavelengths. We conducted experiments to convert the laser wavelength using periodically poled LiNbO3 (PPLN) devices. By injecting mid-infrared laser to a coated sample, we observed excited ultrasonic waves using a laser Doppler vibrometer. We found that transparent resins significantly increase the amplitude of the first-arriving longitudinal wave. Furthermore, when the laser was strongly absorbed in the surface layer, the excitation of longitudinal waves was suppressed. These results were clarified by a one-dimensional model of the thermal generation of ultrasonic waves. We concluded that a laser passing through a resin layer is a viable candidate for the effective inspection of coated CFRP by laser ultrasonic waves. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Laser Wavelengths Suitable for Generating Ultrasonic Waves in Resin-Coated Carbon Fiber Composites | |
type | Journal Paper | |
journal volume | 3 | |
journal issue | 3 | |
journal title | Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems | |
identifier doi | 10.1115/1.4046719 | |
page | 31103 | |
tree | Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems:;2020:;volume( 003 ):;issue: 003 | |
contenttype | Fulltext |