Rutsch, Matthias ; Unger, Alexander ; Allevato, Gianni ; Hinrichs, Jan ; Jäger, Axel ; Kaindl, Thomas ; Kupnik, Mario (2024)
Waveguide for air-coupled ultrasonic phased-arrays with propagation time compensation and plug-in assembly.
In: The Journal of the Acoustical Society of America, 2021, 150 (5)
doi: 10.26083/tuprints-00027708
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
Waveguides allow grating lobe free beamforming for air-coupled ultrasonic phased-arrays by reducing the effective inter-element spacing to half wavelength. Since the sound waves propagate through the waveguide ducts, additional time delays are introduced. In this work, we present analytical, numerical, and experimental methods to estimate these time delays. Afterwards, two different waveguides are compared. The first one consists of equal-length ducts, requiring a time-consuming assembly process of the ultrasonic phased-array. In contrast, the second waveguide consists of Bézier-shaped ducts of unequal lengths but a planar input port allowing fast assembly. The analytical model is based on the geometric lengths of the waveguide ducts. The numerical model relies on a transient finite element analysis. All simulations are validated in an anechoic chamber using a calibrated microphone. The analytical (7.6% deviation) and numerical (3.2% deviation) propagation time models are in good agreement with the measurements. By using the analyzed propagation times for the compensation of the unequal waveguide duct lengths, we restored the beamforming capability without significant sound pressure level (SPL) loss. This work shows the possibility of reduced transducer assembly time for waveguided air-coupled phased-arrays without a reduced SPL.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Rutsch, Matthias ; Unger, Alexander ; Allevato, Gianni ; Hinrichs, Jan ; Jäger, Axel ; Kaindl, Thomas ; Kupnik, Mario |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Waveguide for air-coupled ultrasonic phased-arrays with propagation time compensation and plug-in assembly |
| Sprache: | Englisch |
| Publikationsjahr: | 10 September 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 1 November 2021 |
| Ort der Erstveröffentlichung: | Melville |
| Verlag: | AIP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of the Acoustical Society of America |
| Jahrgang/Volume einer Zeitschrift: | 150 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.26083/tuprints-00027708 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/27708 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | Waveguides allow grating lobe free beamforming for air-coupled ultrasonic phased-arrays by reducing the effective inter-element spacing to half wavelength. Since the sound waves propagate through the waveguide ducts, additional time delays are introduced. In this work, we present analytical, numerical, and experimental methods to estimate these time delays. Afterwards, two different waveguides are compared. The first one consists of equal-length ducts, requiring a time-consuming assembly process of the ultrasonic phased-array. In contrast, the second waveguide consists of Bézier-shaped ducts of unequal lengths but a planar input port allowing fast assembly. The analytical model is based on the geometric lengths of the waveguide ducts. The numerical model relies on a transient finite element analysis. All simulations are validated in an anechoic chamber using a calibrated microphone. The analytical (7.6% deviation) and numerical (3.2% deviation) propagation time models are in good agreement with the measurements. By using the analyzed propagation times for the compensation of the unequal waveguide duct lengths, we restored the beamforming capability without significant sound pressure level (SPL) loss. This work shows the possibility of reduced transducer assembly time for waveguided air-coupled phased-arrays without a reduced SPL. |
| Freie Schlagworte: | Architectural acoustics, Microphones, Acoustic signal processing, Acoustic transducers, Acoustic waveguides, Antennas, Printed circuit board, Numerical methods, Finite-element analysis, Boundary element methods |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-277082 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 621.3 Elektrotechnik, Elektronik |
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Mess- und Sensortechnik |
| Hinterlegungsdatum: | 10 Sep 2024 12:13 |
| Letzte Änderung: | 11 Sep 2024 10:04 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Waveguide for air-coupled ultrasonic phased-arrays with propagation time compensation and plug-in assembly. (deposited 10 Sep 2024 12:13) [Gegenwärtig angezeigt]
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