Non-contact imaging of subsurface defects using a scanning laser source

Hayashi, Takahiro; Mori, Naoki; Ueno, Tomotake

Ultrasonics, 2021, 119, 106560

Number of Access:420（2025-08-14 03:49 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/85206

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Title
Non-contact imaging of subsurface defects using a scanning laser source
Creator
NRID
1000030324479 1000030324479
ORCID
0000-0001-6064-4658 0000-0001-6064-4658
researchmap permalink
takahiro_hayashi takahiro_hayashi
Scopus Author ID
37064150200 37064150200
CreatorName
Hayashi, Takahiro
NRID
1000000802092 1000000802092
researchmap permalink
7000020478 7000020478
Scopus Author ID
55614094500 55614094500
ORCID
0000-0002-0707-3443 0000-0002-0707-3443
CreatorName
Mori, Naoki
CreatorName
Ueno, Tomotake
Subject
Defect imaging
Laser ultrasonics
Scanning laser source
Subsurface defects
Description
Hayashi T., Mori N., Ueno T. Non-contact imaging of subsurface defects using a scanning laser source. Ultrasonics, 2021, Vol. 119, 106560. https://doi.org/10.1016/j.ultras.2021.106560.
Abstract
The quality of additive manufacturing (AM) components must be guaranteed to ensure wide applicability, and a nondestructive inspection technology is required in this regard. Therefore, this study examined a method for detecting subsurface defects using ultrasonic waves excited by a laser. Fundamental experiments showed that wideband ultrasonic waves can be excited with a suitable signal-to-noise ratio using high-repetition laser pulses. Images of subsurface defects were appropriately obtained using a scanning laser source (SLS) with broadband waves for an aluminum alloy flat plate with artificial defects. The imaging experiments showed that the acquisition condition depends on the local defect resonant (LDR) frequency in the defective part. The imaging technique also enabled to detect subsurface circular defects created by AM with the diameter below 1.0 mm that were undetectably small in our previous study using the SLS. Based on results of these experiments and a finite element analysis, the following guideline is proposed: the LDR frequencies of targeted defects must be included in the tested frequency range.
Publisher
Elsevier B.V.
Source Title
Ultrasonics
Volume (Issue)
119
Page
106560
Date of Issued
2021-08-25
Language
English
Handle URL
https://hdl.handle.net/11094/85206
PISSN
0041624X
NCID
AA00876332
AA11541030
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.ultras.2021.106560
Access Rights
open access
CopyRight
© 2021 Published by Elsevier B.V. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article