Detection of a Defect on the Back of a Pipe by Noncontact Remote Measurements

Hayashi, Takahiro

Journal of Pressure Vessel Technology, 2018, 140(6), 061401

Number of Access:294（2025-11-13 08:33 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/85207

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Title
Detection of a Defect on the Back of a Pipe by Noncontact Remote Measurements
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
Abstract
Pipe inspection is generally executed with ultrasonic pulse echo testing where a small range of pipe wall under an ultrasonic transducer can be evaluated in one measurement. Costly and laborious point-by-point testing is required if a whole range of a pipe should be inspected. The author has investigated fast defect imaging for a plate-like structure using a scanning laser source (SLS) technique as an efficient defect inspection technique. Although the imaging technique is feasible in noncontact remote measurements, only a plate cross section under the laser irradiation surface can be evaluated. This study describes detection of wall thinning on the back of a pipe using resonance of guided wave propagating in a pipe circumference by noncontact remote measurements with the SLS technique. The narrowband elastic waves are generated in a pipe by modulating laser pulses with fiber laser equipment. When the modulation frequency is in harmony with the resonance frequency of a circumferential guided wave, the distribution of the frequency spectrum peak obtained with the SLS technique becomes identical to the resonance pattern of the circumferentially guided wave mode. The distributions are distorted for a pipe with wall thinning on the back indicating that this technique has a potential for detection of defects on the back of a pipe.
Publisher
American Society of Mechanical Engineers (ASME)
Source Title
Journal of Pressure Vessel Technology
Volume (Issue)
140(6)
Page
061401
Date of Issued
2018-11-12
Language
English
Handle URL
https://hdl.handle.net/11094/85207
PISSN
00949930
eISSN
15288978
NCID
AA00705442
AA11943464
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1115/1.4041433
Access Rights
open access
CopyRight
© 2018 ASME. This manuscript version is made available under the Creative Commons Attribution 4.0 International License.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article