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Phased array transducer for emitting 40-kHz air-coupled ultrasound without grating lobes

Konetzke, Eric ; Rutsch, Matthias ; Hoffmann, Maik ; Unger, Alexander ; Golinske, René ; Killat, Dirk ; Ramadas, Nishal ; Dixon, Steve ; Kupnik, Mario (2015)
Phased array transducer for emitting 40-kHz air-coupled ultrasound without grating lobes.
IEEE IUS 2015. Taipei, Taiwan (21.10.2015-24.10.2015)
Konferenzveröffentlichung, Bibliographie

Kurzbeschreibung (Abstract)

We introduce an ultrasonic one–dimensional (1D) air–coupled phased array transducer, operating at 40 kHz with- out any grating lobes. It is well known, that this achievement is only possible when each transducer element is small enough for an element pitch that is equal to or less than half of the wavelength, i.e. ≤ 4.3 mm for 40 kHz operation frequency. As far as we know, conventionally low frequency array designs for air–coupled transducer applications were not possible at 40 kHz due to this inter element spacing requirement. The main idea is to separate the acoustic aperture from the actual radiating aperture of the ultrasonic transducer. We use acoustic waveguides, forming a smart packaging layer, to fulfill the half–wavelength criteria for the pitch and to benefit from concentrating the acoustic energy from several single ultrasonic transducers into a smaller effective aperture. A proof–of–concept prototype array was built and characterized. An impressive 130 ± 1 dB sound pressure level (SPL) is observed at a distance of 1 m. The opening angle of the array is 110◦ in total, without any grating lobes. For future work, we plan extending the approach to build an air-coupled fully populated 2D phased array transducer as well.

Typ des Eintrags: Konferenzveröffentlichung
Erschienen: 2015
Autor(en): Konetzke, Eric ; Rutsch, Matthias ; Hoffmann, Maik ; Unger, Alexander ; Golinske, René ; Killat, Dirk ; Ramadas, Nishal ; Dixon, Steve ; Kupnik, Mario
Art des Eintrags: Bibliographie
Titel: Phased array transducer for emitting 40-kHz air-coupled ultrasound without grating lobes
Sprache: Englisch
Publikationsjahr: 21 Oktober 2015
Veranstaltungstitel: IEEE IUS 2015
Veranstaltungsort: Taipei, Taiwan
Veranstaltungsdatum: 21.10.2015-24.10.2015
Kurzbeschreibung (Abstract):

We introduce an ultrasonic one–dimensional (1D) air–coupled phased array transducer, operating at 40 kHz with- out any grating lobes. It is well known, that this achievement is only possible when each transducer element is small enough for an element pitch that is equal to or less than half of the wavelength, i.e. ≤ 4.3 mm for 40 kHz operation frequency. As far as we know, conventionally low frequency array designs for air–coupled transducer applications were not possible at 40 kHz due to this inter element spacing requirement. The main idea is to separate the acoustic aperture from the actual radiating aperture of the ultrasonic transducer. We use acoustic waveguides, forming a smart packaging layer, to fulfill the half–wavelength criteria for the pitch and to benefit from concentrating the acoustic energy from several single ultrasonic transducers into a smaller effective aperture. A proof–of–concept prototype array was built and characterized. An impressive 130 ± 1 dB sound pressure level (SPL) is observed at a distance of 1 m. The opening angle of the array is 110◦ in total, without any grating lobes. For future work, we plan extending the approach to build an air-coupled fully populated 2D phased array transducer as well.

Freie Schlagworte: Phased Array, Air-Coupled, Grating lobes, Transmit, 40 kHz Ultrasound
Fachbereich(e)/-gebiet(e): 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Elektromechanische Konstruktionen (aufgelöst 18.12.2018)
18 Fachbereich Elektrotechnik und Informationstechnik > Mess- und Sensortechnik
18 Fachbereich Elektrotechnik und Informationstechnik
Hinterlegungsdatum: 04 Nov 2015 13:38
Letzte Änderung: 04 Nov 2015 14:04
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