A Non-expensive Massive Transducer Array to Generate Helical Wavefronts in Air

In this work we present experimental characterization results of a non- expensive massive ultrasonic transducer array to generate helical wavefronts in air. The multitransducer is composed by 390 elements operating at a nominal frequency of 40kHz, precisely located on a helical surface substrate. Th...

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Bibliographic Details
Published in:Physics procedia 2015, Vol.70, p.932-935
Main Authors: Muelas, H. Ruben Dario, Pazos-Ospina, J.F., Ealo, Joao L.
Format: Article
Language:English
Subjects:
acoustic vortex
helical wavefront
multitransducer
phased array systems
spatial delays
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Summary:In this work we present experimental characterization results of a non- expensive massive ultrasonic transducer array to generate helical wavefronts in air. The multitransducer is composed by 390 elements operating at a nominal frequency of 40kHz, precisely located on a helical surface substrate. The same excitation signal is applied to all elements. Due to the “spatial” delay applied to each element, the device is able to generate a helical wavefront of topological charge m =+1. A maximum sound pressure level of 137dB was measured, on a transverse plane located 1.8 m far from the device, when a 15 Vpp excitation voltage was applied. This work also includes a detailed description of the excitation electronics, the electroacoustic characterization of the array elements (phase, directivity and frequency response) and the inter-element cross-talk quantification. Furthermore, a discussion of the potential of use of this multitransducer device is presented.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2015.08.193