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Eigen frequencies and directivity patterns of a spherical acoustic transducer

Daher Diab 1, 2 Fabrice Lefebvre 1, 2 Georges Nassar 1, 2 Nikolay Smagin 1, 3 Adnan Naja 4 Fawaz El Omar 4 
2 MAMINA - IEMN - Matériaux et Acoustiques pour MIcro et NAno systèmes intégrés - IEMN
IEMN-DOAE - Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520
3 TPIA - IEMN - Transduction, Propagation et Imagerie Acoustique - IEMN
IEMN-DOAE - Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520
Abstract : In this work, a spherical acoustic sensor has been developed, and is composed of two Plexiglas half-spheres and a PZ26 piezoelectric ring that can be either used as an exciter or as a sensor. The resonance of the spherical shell is studied analytically, numerically by finite elements modeling in COMSOL Multiphysics, and verified by experimental analysis using an impedance analyzer (Wayne Kerr 6520). The results obtained show a good agreement between the three methods, the first four resonant frequencies of the spherical sensor are respectively 18, 22, 35 and 43.6 KHz, the last frequency corresponds to the breathing mode. And finally the frequency response, surface displacements and directivity patterns have been measured using the Laser Doppler Vibrometry technique (LDV).
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Submitted on : Monday, February 7, 2022 - 9:38:22 AM
Last modification on : Wednesday, March 23, 2022 - 3:51:35 PM

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Daher Diab, Fabrice Lefebvre, Georges Nassar, Nikolay Smagin, Adnan Naja, et al.. Eigen frequencies and directivity patterns of a spherical acoustic transducer. International journal of digital information and wireless communications (IJDIWC), Hong Kong : Society of Digital Information and Wireless Communications,, 2018, 8 (1), pp.47-51. ⟨10.17781/P002404⟩. ⟨hal-03559602⟩

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