Gleiter, A. und Riegert, G. und Zweschper, Th. und Degenhardt, R. und Busse, G. (2006) Advanced ultrasound activated Lockin-Thermography for defect selective depth resolved imaging. 28th Thermosense Conference, 2006-04-17 - 2006-04-20, Orlando, Florida (USA).
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Kurzfassung
Ultrasound activated Lockin-Thermography („ultrasound attenuation mapping“) is a defect selective NDT-technique. Its main advantage is a high probability of defect detection since only defects produce a signal while all other features are suppressed. The mechanism involved is local sound absorption which turns a variably loaded defect into a heat source. Attenuation of elastic waves in a solid due to internal mechanical losses was reported for the first time in 1979 by Henneke and colleagues for continuous and pulsed ultrasound injection. Later, amplitude modulated ultrasound was used to derive frequency coded phase angle images combining defect-selectivity with robustness of measurement. With mono-frequent ultrasound excitation a standing wave pattern might hide defects. With additional modulation of the ultrasound frequency such a misleading pattern can be minimized. Applications related to quality maintenance (aerospace, automotive industry) will be presented in order to illustrate the potential of frequency modulated ultrasound excitation and its applications.
elib-URL des Eintrags: | https://elib.dlr.de/47483/ | ||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Paper) | ||||||||||||||||||||||||
Titel: | Advanced ultrasound activated Lockin-Thermography for defect selective depth resolved imaging | ||||||||||||||||||||||||
Autoren: |
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Datum: | 2006 | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
Stichwörter: | Lockin-Thermography, Sonic Thermography, Ultrasound Thermography, Attenuation Mapping, Defect Selective NDT, dark field method | ||||||||||||||||||||||||
Veranstaltungstitel: | 28th Thermosense Conference | ||||||||||||||||||||||||
Veranstaltungsort: | Orlando, Florida (USA) | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 17 April 2006 | ||||||||||||||||||||||||
Veranstaltungsende: | 20 April 2006 | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||
HGF - Programmthema: | Starrflügler (alt) | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | L AR - Starrflüglerforschung | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Strukturen & Werkstoffe (alt) | ||||||||||||||||||||||||
Standort: | Braunschweig | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Faserverbundleichtbau und Adaptronik | ||||||||||||||||||||||||
Hinterlegt von: | Ries, Doris | ||||||||||||||||||||||||
Hinterlegt am: | 21 Apr 2007 | ||||||||||||||||||||||||
Letzte Änderung: | 24 Apr 2024 19:09 |
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