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Air-Coupled Ultrasonic Spiral Phased Array for High-Precision Beamforming and Imaging by Gianni Allevato; Matthias Rutsch; Jan Hinrichs; Christoph Haugwitz; Raphael Muller; Marius Pesavento; Mario Kupnik is a Engineering article available to read on EtoBox.

What is Air-Coupled Ultrasonic Spiral Phased Array for High-Precision Beamforming and Imaging about?

Sparse spiral phased arrays are advantageous for many emerging air-coupled ultrasonic applications, since grating lobes are prevented without being constrained to the half-wavelength element spacing requirement of well-known dense arrays. As a result, the limitation on the maximum transducer diameter is omitted and the aperture can be enlarged for improving the beamforming precision without requiring the number of transducers to be increased. We demonstrate that in-air imaging, in particular, benefits from these features, enabling large-volume, unambiguous and high-resolution image formation. Therefore, we created an air-coupled ultrasonic phased array based on the Fermat spiral, capable of transmit, receive and pulse-echo operation, as well as 3D imaging. The array consists of 64 piezoelectric 40-kHz transducers (Murata MA40S4S), spanning an aperture of 200 mm. First, we provide an application-independent numerical and experimental characterization of the conventional beamforming performance of all operation modes for varying focal directions and distances. Second, we examine the resulting imaging capabilities using the single line transmission technique. Apart from the high maxim

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Author

Gianni Allevato; Matthias Rutsch; Jan Hinrichs; Christoph Haugwitz; Raphael Muller; Marius Pesavento; Mario Kupnik

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Published

2022

Language

EN

Field

Engineering (Physical Sciences)