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A Subspace Based Method for Near Transducer Interference Suppression
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.ORCID iD: 0000-0002-6216-6132
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
2018 (English)In: 2018 IEEE International Ultrasonics Symposium, IEEE, 2018, article id 8579817Conference paper, Published paper (Refereed)
Abstract [en]

In applications of direct -contact ultrasound, operating in pulse -echo mode, the transient resulting from the excitation of the transducer will mask any reflections from scatterers near the transducer surface. This results in a so called dead zone, preventing any defects to be detected. This is normally solved by introducing a delay line between the transducer and the specimen. There are drawbacks with this approach, and therefore we propose an alternative technique, which instead suppresses the transient from the excitation by a statistical modeling technique. This paper describes an algorithm for reduction of the dead zone and shows with experiments using both a single -element transducer and a 128 element linear array, that the transient from the transducer excitation can be suppressed sufficiently well to reveal side -drilled holes in a test block, which were previously masked.

Place, publisher, year, edition, pages
IEEE, 2018. article id 8579817
Series
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
URN: urn:nbn:se:ltu:diva-72801DOI: 10.1109/ULTSYM.2018.8579817ISI: 000458693000152Scopus ID: 2-s2.0-85060601099ISBN: 978-1-5386-3425-7 (electronic)ISBN: 978-1-5386-3426-4 (print)OAI: oai:DiVA.org:ltu-72801DiVA, id: diva2:1286218
Conference
2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; Oct 22-25, 2018
Available from: 2019-02-06 Created: 2019-02-06 Last updated: 2019-03-11Bibliographically approved

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Carlson, Johan E.

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CiteExportLink to record
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  • apa
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  • de-DE
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  • nn-NB
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Output format
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