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Advanced ultrasound activated Lockin-Thermography for defect selective depth resolved imaging

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.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Advanced ultrasound activated Lockin-Thermography for defect selective depth resolved imaging
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Gleiter, A.Institute of Polymer Testing and Polymer Science, Department of Non-Destructive Testing
Riegert, G.Institute of Polymer Testing and Polymer Science, Department of Non-Destructive Testing
Zweschper, Th.Institute of Polymer Testing and Polymer Science, Department of Non-Destructive Testing
Degenhardt, R.NICHT SPEZIFIZIERT
Busse, G.Institute of Polymer Testing and Polymer Science, Department of Non-Destructive Testing
Datum:2006
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
Veranstaltungsdatum:2006-04-17 - 2006-04-20
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Strukturen & Werkstoffe
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik
Hinterlegt von: Doris Ries
Hinterlegt am:21 Apr 2007
Letzte Änderung:27 Apr 2009 13:34

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