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A Subspace Based Method for Near Transducer Interference Suppression
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.ORCID-id: 0000-0002-6216-6132
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
2018 (engelsk)Inngår i: 2018 IEEE International Ultrasonics Symposium, IEEE, 2018, artikkel-id 8579817Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
IEEE, 2018. artikkel-id 8579817
Serie
IEEE International Ultrasonics Symposium, ISSN 1948-5719, E-ISSN 1948-5727
HSV kategori
Forskningsprogram
Signalbehandling
Identifikatorer
URN: urn:nbn:se:ltu:diva-72801DOI: 10.1109/ULTSYM.2018.8579817ISI: 000458693000152Scopus ID: 2-s2.0-85060601099ISBN: 978-1-5386-3425-7 (digital)ISBN: 978-1-5386-3426-4 (tryckt)OAI: oai:DiVA.org:ltu-72801DiVA, id: diva2:1286218
Konferanse
2018 IEEE International Ultrasonics Symposium, IUS 2018; Kobe; Japan; Oct 22-25, 2018
Tilgjengelig fra: 2019-02-06 Laget: 2019-02-06 Sist oppdatert: 2025-10-22bibliografisk kontrollert

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Carlson, Johan E.

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