Rutsch, Matthias ; Unger, Alexander ; Allevato, Gianni ; Hinrichs, Jan ; Jäger, Axel ; Kaindl, Thomas ; Kupnik, Mario (2021)
Waveguide for air-coupled ultrasonic phased-arrays with propagation time compensation and plug-in assembly.
In: The Journal of the Acoustical Society of America, 150 (5)
doi: 10.1121/10.0006969
Article, Bibliographie
This is the latest version of this item.
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.
| Item Type: | Article |
|---|---|
| Erschienen: | 2021 |
| Creators: | Rutsch, Matthias ; Unger, Alexander ; Allevato, Gianni ; Hinrichs, Jan ; Jäger, Axel ; Kaindl, Thomas ; Kupnik, Mario |
| Type of entry: | Bibliographie |
| Title: | Waveguide for air-coupled ultrasonic phased-arrays with propagation time compensation and plug-in assembly |
| Language: | English |
| Date: | 1 November 2021 |
| Place of Publication: | Melville |
| Publisher: | AIP Publishing |
| Journal or Publication Title: | The Journal of the Acoustical Society of America |
| Volume of the journal: | 150 |
| Issue Number: | 5 |
| DOI: | 10.1121/10.0006969 |
| Corresponding Links: | |
| 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. |
| Uncontrolled Keywords: | Architectural acoustics, Microphones, Acoustic signal processing, Acoustic transducers, Acoustic waveguides, Antennas, Printed circuit board, Numerical methods, Finite-element analysis, Boundary element methods |
| Classification DDC: | 600 Technology, medicine, applied sciences > 621.3 Electrical engineering, electronics |
| Divisions: | 18 Department of Electrical Engineering and Information Technology 18 Department of Electrical Engineering and Information Technology > Measurement and Sensor Technology |
| Date Deposited: | 11 Sep 2024 10:06 |
| Last Modified: | 11 Sep 2024 10:06 |
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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)
- Waveguide for air-coupled ultrasonic phased-arrays with propagation time compensation and plug-in assembly. (deposited 11 Sep 2024 10:06) [Currently Displayed]
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