Defect imaging with guided waves propagating in a long range

Hayashi, Takahiro; Nagao, Masahiro; Murase, Morimasa

doi:https://doi.org/10.1299/jmmp.2.888

Defect imaging with guided waves propagating in a long range

Hayashi, Takahiro; Nagao, Masahiro; Murase, Morimasa

Journal of Solid Mechanics and Materials Engineering, 2008, 2(7), 888-899

Number of Access:184（2025-06-07 18:47 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/84516

Link to primary information

File	Format	Terms of use	Size	Views	Date.Available	Description	information
JMMP_2_7_888	pdf	None	1.58 MB	108	2021.09.22

Item Information

Output File Export EndNote Basic Export Mendeley

Title	Defect imaging with guided waves propagating in a long range
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
	CreatorName Nagao, Masahiro
	CreatorName Murase, Morimasa
Subject	Ultrasonic Nondestructive Inspection
	Guided Waves
	Imaging
	Long-Range Inspection
Description	Takahiro HAYASHI, Masahiro NAGAO, Morimasa MURASE, Defect imaging with guided waves propagating in a long range, Journal of Solid Mechanics and Materials Engineering, 2008, 2(7), pp. 888-899, https://doi.org/10.1299/jmmp.2.888.
Abstract	Pipe inspection with guided waves is expected to provide an efficient screening technique that will enable the inspection of lengths of pipe of up to a few dozen meters. In contrast with conventional inspection equipment widely used in practical inspection that employ easy-to-use axisymmetric modes, the present authors have developed a defect imaging technique that uses non-axisymmetric modes. In a previous paper, defect images were only available over a short range of 1.2 meters from the transducers. Therefore, in the present study, the effects of long propagation on defect images are discussed. Long-range imaging was performed experimentally using source signals and their multiple reflections between both edges of a four-meter-long pipe, rather than the reflected waves from defects. In the experimental investigation, large degradation of images was found in the far field. A computer simulation of the guided wave propagation reveals that a major reason for the degradation is the difference between dispersion curves for an actual pipe and the theoretical dispersion curves. In order to reduce the degradation, images were obtained by neglecting higher modes with larger differences in phase velocity. As a result, images were obtained at correct locations at distances of up to approximately 20 meters from the transducers.
Publisher	The Japan Society of Mechanical Engineers
Source Title	Journal of Solid Mechanics and Materials Engineering
Volume (Issue)	2(7)
Page	888-899
Date of Issued	2008-07
Language	English
Handle URL	https://hdl.handle.net/11094/84516
eISSN	18809871
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1299/jmmp.2.888
Access Rights	open access
CopyRight	© 2008 by The Japan Society of Mechanical Engineers.
oaire:version	Accepted Manuscript
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Journal of Solid Mechanics and Materials Engineering. 2008, 2(7), p. 888-899
DC.title	Defect imaging with guided waves propagating in a long range
DC.creator	Hayashi, Takahiro
	Nagao, Masahiro
	Murase, Morimasa
DC.publisher	The Japan Society of Mechanical Engineers
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2008-07
DC.identifier	https://doi.org/10.1299/jmmp.2.888
DC.subject	Ultrasonic Nondestructive Inspection
	Guided Waves
	Imaging
	Long-Range Inspection
DC.description	Takahiro HAYASHI, Masahiro NAGAO, Morimasa MURASE, Defect imaging with guided waves propagating in a long range, Journal of Solid Mechanics and Materials Engineering, 2008, 2(7), pp. 888-899, https://doi.org/10.1299/jmmp.2.888.
DCTERMS.abstract	Pipe inspection with guided waves is expected to provide an efficient screening technique that will enable the inspection of lengths of pipe of up to a few dozen meters. In contrast with conventional inspection equipment widely used in practical inspection that employ easy-to-use axisymmetric modes, the present authors have developed a defect imaging technique that uses non-axisymmetric modes. In a previous paper, defect images were only available over a short range of 1.2 meters from the transducers. Therefore, in the present study, the effects of long propagation on defect images are discussed. Long-range imaging was performed experimentally using source signals and their multiple reflections between both edges of a four-meter-long pipe, rather than the reflected waves from defects. In the experimental investigation, large degradation of images was found in the far field. A computer simulation of the guided wave propagation reveals that a major reason for the degradation is the difference between dispersion curves for an actual pipe and the theoretical dispersion curves. In order to reduce the degradation, images were obtained by neglecting higher modes with larger differences in phase velocity. As a result, images were obtained at correct locations at distances of up to approximately 20 meters from the transducers.
DC.rights	© 2008 by The Japan Society of Mechanical Engineers.
DC.format	84516
citation_title	Defect imaging with guided waves propagating in a long range
citation_author	Hayashi, Takahiro
	Nagao, Masahiro
	Murase, Morimasa
citation_publisher	The Japan Society of Mechanical Engineers
citation_language	English
citation_date	2008-07
citation_journal_title	Journal of Solid Mechanics and Materials Engineering
citation_volume	2
citation_issue	7
citation_firstpage	888
citation_lastpage	899
citation_doi	https://doi.org/10.1299/jmmp.2.888
citation_public_url	https://hdl.handle.net/11094/84516

Defect imaging with guided waves propagating in a long range

Link to primary information

Item Information

Show details