Prove the ability of microwave nondestructive method combined with signal processing to determine the position of a circumferential crack in pipes.
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| Title: | Prove the ability of microwave nondestructive method combined with signal processing to determine the position of a circumferential crack in pipes. |
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| Authors: | Abbasi, K.1 kabbasi@shirazu.ac.ir, Ito, S.1, Hashizume, H.1 |
| Source: | International Journal of Applied Electromagnetics & Mechanics. 2008, Vol. 28 Issue 4, p429-439. 11p. 2 Diagrams, 1 Chart, 10 Graphs. |
| Subjects: | Nondestructive testing equipment, Pipe maintenance & repair, Fourier transforms, Electromagnetic waves |
| Abstract: | This paper presents a technique using microwaves nondestructive testing to detect circumferential crack and its location in stainless steels pipe. This approach is based on the surface current flow in the inner surface of the test pipe, when electromagnetic (EM) waves are propagating inside the pipe. Since the conductive pipe is an excellent waveguide, EM-wave can be propagated inside the pipe above the cutoff frequencies in large distances. To detect circumferential crack in pipes, a suitable EM-wave mode is generated in the inspected pipe with crack. For this purpose, a mode-converter is used to convert rectangular TE_{10}-mode to the circular TM_{01}-mode. This mode is controlled and resonated by a moving a plunger mounted in the mode-converter. To show the crack existence from experimental data, the background signal of a pipe without a crack is subtracted from that one with a crack. The location of the crack is found by knowing the time of flight (TOF) of the reflected waves and the group velocities of the waves in each part of the waveguides used in this study. The TOFs are obtained through an analysis based on the Inverse Fast Fourier Transform (IFFT) of the signals in the frequency domain and a method of signal cancellation. The obtained results show that this NDT method is suitable for determining of crack locations in large pipes without point-by-point screening since electromagnetic waves above their cutoff frequencies can propagate in pipes without significant attenuation loss. Our study is of a fundamental interest in nuclear power plants and piping systems. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Applied Electromagnetics & Mechanics is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 35771529 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Prove the ability of microwave nondestructive method combined with signal processing to determine the position of a circumferential crack in pipes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Abbasi%2C+K%2E%22">Abbasi, K.</searchLink><relatesTo>1</relatesTo><i> kabbasi@shirazu.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Ito%2C+S%2E%22">Ito, S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hashizume%2C+H%2E%22">Hashizume, H.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Applied+Electromagnetics+%26+Mechanics%22">International Journal of Applied Electromagnetics & Mechanics</searchLink>. 2008, Vol. 28 Issue 4, p429-439. 11p. 2 Diagrams, 1 Chart, 10 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Nondestructive+testing+equipment%22">Nondestructive testing equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Pipe+maintenance+%26+repair%22">Pipe maintenance & repair</searchLink><br /><searchLink fieldCode="DE" term="%22Fourier+transforms%22">Fourier transforms</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+waves%22">Electromagnetic waves</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper presents a technique using microwaves nondestructive testing to detect circumferential crack and its location in stainless steels pipe. This approach is based on the surface current flow in the inner surface of the test pipe, when electromagnetic (EM) waves are propagating inside the pipe. Since the conductive pipe is an excellent waveguide, EM-wave can be propagated inside the pipe above the cutoff frequencies in large distances. To detect circumferential crack in pipes, a suitable EM-wave mode is generated in the inspected pipe with crack. For this purpose, a mode-converter is used to convert rectangular TE_{10}-mode to the circular TM_{01}-mode. This mode is controlled and resonated by a moving a plunger mounted in the mode-converter. To show the crack existence from experimental data, the background signal of a pipe without a crack is subtracted from that one with a crack. The location of the crack is found by knowing the time of flight (TOF) of the reflected waves and the group velocities of the waves in each part of the waveguides used in this study. The TOFs are obtained through an analysis based on the Inverse Fast Fourier Transform (IFFT) of the signals in the frequency domain and a method of signal cancellation. The obtained results show that this NDT method is suitable for determining of crack locations in large pipes without point-by-point screening since electromagnetic waves above their cutoff frequencies can propagate in pipes without significant attenuation loss. Our study is of a fundamental interest in nuclear power plants and piping systems. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Applied Electromagnetics & Mechanics is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3233/JAE-2008-995 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 429 Subjects: – SubjectFull: Nondestructive testing equipment Type: general – SubjectFull: Pipe maintenance & repair Type: general – SubjectFull: Fourier transforms Type: general – SubjectFull: Electromagnetic waves Type: general Titles: – TitleFull: Prove the ability of microwave nondestructive method combined with signal processing to determine the position of a circumferential crack in pipes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Abbasi, K. – PersonEntity: Name: NameFull: Ito, S. – PersonEntity: Name: NameFull: Hashizume, H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: 2008 Type: published Y: 2008 Identifiers: – Type: issn-print Value: 13835416 Numbering: – Type: volume Value: 28 – Type: issue Value: 4 Titles: – TitleFull: International Journal of Applied Electromagnetics & Mechanics Type: main |
| ResultId | 1 |
