A Resonance-Free Nanofilm Airborne Ultrasound Emitter

  • In recent years the demand for airborne ultrasound techniques for non-destructive materials testing has increased remarkably. The applications for non-contact airborne ultrasound techniques are very broad and range from detection of flaws in composite laminates, solar cells and printed circuit boards to the applications in medicine and food industry. Conventional piezoelectric ultrasound transducers are mostly narrowbanded, show large resonance oscillations after a short excitation and therefore are generally not suitable for pulse-echo applications. In this contribution we present a novel thermoacoustic approach for the generation of broad band airborne ultrasound and investigate the applicability of resonance-free thermoacoustic emitters for very short high pressure airborne ultrasound pulses. We report on measurements of thermoacoustic emitters consisting of metal film below 50 nm thickness, generating sound pressure values of more than 140 dB in 60 mm distance and compare theIn recent years the demand for airborne ultrasound techniques for non-destructive materials testing has increased remarkably. The applications for non-contact airborne ultrasound techniques are very broad and range from detection of flaws in composite laminates, solar cells and printed circuit boards to the applications in medicine and food industry. Conventional piezoelectric ultrasound transducers are mostly narrowbanded, show large resonance oscillations after a short excitation and therefore are generally not suitable for pulse-echo applications. In this contribution we present a novel thermoacoustic approach for the generation of broad band airborne ultrasound and investigate the applicability of resonance-free thermoacoustic emitters for very short high pressure airborne ultrasound pulses. We report on measurements of thermoacoustic emitters consisting of metal film below 50 nm thickness, generating sound pressure values of more than 140 dB in 60 mm distance and compare the results with piezoelectric airborne ultrasound transducers. Our experimental investigations show that such thermoacoustic devices can be used as a broad band emitters using pulse excitation.zeige mehrzeige weniger

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Metadaten
Autor*innen:Marc Kreutzbruck
Weitere Person:Maxim Daschewski, Jens PragerORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Deutsch
Titel des übergeordneten Werkes (Deutsch):QNDE Conference 2012
Jahr der Erstveröffentlichung:2012
Veranstaltung:QNDE Conference 2012
Veranstaltungsort:Denver, CO, USA
Beginndatum der Veranstaltung:2012-07-15
Enddatum der Veranstaltung:2012-12-20
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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