Focusing of ferroelectret air-coupled ultrasound transducers
- Air-coupled ultrasound has been applied increasingly as a non-destructive testing method for lightweight construction in recent years. It is particularly appropriate for composite materials being used in automotive and aviation industry. Air-coupled ultrasound transducers mostly consist of piezoelectric materials and matching layers. However, their fabrication is challenging and their signal-to-noise ratio often not sufficient for many testing requirements. To enhance the efficiency, air-coupled ultrasound transducers made of cellular polypropylene have been developed. Because of its small density and sound velocity, this piezoelectric ferroelectret matches the small acoustic impedance of air much better than matching layers applied in conventional transducers. In our contribution, we present two different methods of spherical focusing of ferroelectret transducers for the further enhancement of their performance in NDT applications. Measurements on carbon-fiber-reinforced polymerAir-coupled ultrasound has been applied increasingly as a non-destructive testing method for lightweight construction in recent years. It is particularly appropriate for composite materials being used in automotive and aviation industry. Air-coupled ultrasound transducers mostly consist of piezoelectric materials and matching layers. However, their fabrication is challenging and their signal-to-noise ratio often not sufficient for many testing requirements. To enhance the efficiency, air-coupled ultrasound transducers made of cellular polypropylene have been developed. Because of its small density and sound velocity, this piezoelectric ferroelectret matches the small acoustic impedance of air much better than matching layers applied in conventional transducers. In our contribution, we present two different methods of spherical focusing of ferroelectret transducers for the further enhancement of their performance in NDT applications. Measurements on carbon-fiber-reinforced polymer (CFRP) samples and on metal adhesive joints performed with commercially available focused air-coupled ultrasound transducers are compared to measurements executed with self-developed focused ferroelectret transducers.…
Autor*innen: | Mate Gaal, Jürgen Bartusch, Florian Schadow, Enrico Köppe, Elmar Dohse |
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Persönliche Herausgeber*innen: | D. E. Chimenti, L. J. Bond |
Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Graue Literatur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation |
Jahr der Erstveröffentlichung: | 2016 |
Verlag: | AIP Publishing |
Verlagsort: | Melville, NY, USA |
Erste Seite: | 080001 |
DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
Freie Schlagwörter: | Air-coupled; Ferroelectret; Focusing; Transducer; Ultrasonic |
Veranstaltung: | 42nd Annual Review of Progress in Quantitative Nondestructive Evaluation |
Veranstaltungsort: | Minneapolis, Minnesota, USA |
Beginndatum der Veranstaltung: | 26.07.2015 |
Enddatum der Veranstaltung: | 31.07.2015 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 11.05.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 09.02.2017 |