A Human Ear-inspired Ultrasonic Transducer (HEUT) for 3-D Localization of Sub-wavelength Scatterers
Journal article
Nie, L., Toulemonde, M., Tang, M-X., Freear, S. and Harput, S. (2023). A Human Ear-inspired Ultrasonic Transducer (HEUT) for 3-D Localization of Sub-wavelength Scatterers. Applied Physics Letters.
Authors | Nie, L., Toulemonde, M., Tang, M-X., Freear, S. and Harput, S. |
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Abstract | The proposed technology aims to enable 3-D localization of scatterers using single-element ultrasonic transducers, which are traditionally limited to 1-D measurements. This is achieved by designing a bespoke acoustic lens with a spiral-shaped pattern similar to the human outer ear, a shape that has evolved for sound source localization. This lens breaks the surface symmetry of the transducer, allowing ultrasonic waves arriving from different directions to be encoded in a certain way that can later be decoded to extract directional information. By employing the mechanism of spatial-encoding of the received signals and decoding via signal processing, the location of sub-wavelength scatterers can be detected in 3-D with a single measurement for sparsely distributed scatterers. The proposed technology is first verified through a simulation study, and then 3-D printed acoustic lenses are used to demonstrate the 3-D encoding functionality of the Human Ear-inspired Ultrasonic Transducer (HEUT) experimentally. A framework is created to localize scatterers in 3-D by processing received signals acquired by a HEUT prototype. With this technology, a single transducer can obtain multi-dimensional information with a single pulse-echo measurement, reducing the number of elements required for performing 3-D ultrasound localization. The proposed spatial-encoding and –decoding technology can be applied to other wave-based imaging methods to develop affordable, practical and compact sensing devices. |
Keywords | single element imaging |
Year | 2023 |
Journal | Applied Physics Letters |
Publisher | AIP Publishing |
ISSN | 1077-3118 |
Publication dates | |
21 Aug 2023 | |
Publication process dates | |
Deposited | 01 Aug 2023 |
Accepted | 28 Jul 2023 |
Accepted author manuscript | License File Access Level Open |
https://openresearch.lsbu.ac.uk/item/9495q
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Accepted author manuscript
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