Appearance in Nature

Müller, Stefan; Tsuji, Kinko

doi:10.1007/978-3-030-05798-5_2

Cited by 1 publication

(1 citation statement)

References 22 publications

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“…Spiral geometries have been observed in nature, from small living systems such as snails, to big phenomena such as hurricanes, and even in the case of the crystal growth of nanostructured zeolites [25][26][27][28]. In the macro world, the mammalian cochlea is a very common natural evidence of spiral coiling, and the Archimedean and Fibonacci spirals are the nonlinear curves often used for its description [19,20].…”

Section: Bio Inspiration and Conceptionmentioning

confidence: 99%

Ultrasonic Transducers Shaped in Archimedean and Fibonacci Spiral: A Comparison

Fiorillo

Pullano

Bianco

et al. 2020

Sensors

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We developed and investigated a particular geometry of transducers, emulating the shape of bats’ cochlea, to transmit and receive ultrasounds in the air. Their design involved the use of polyvinylidene fluoride (PVDF) as a piezoelectric material, thanks to its excellent conformability and flexibility. This material offers the primary requirements for sensing devices in applications such as sonar system or energy harvesting technology. The piezo film was folded according to both the Archimedean and Fibonacci spirals, and their performances were investigated in the frequency range from 20 kHz up to more than 80 kHz. The finite element analysis (FEA) of the proposed transducers highlighted the presence of multiple resonance vibrations, proved by the experimental measurements of the equivalent electric impedance and frequency response. Far-field radiation patterns demonstrated, horizontally and vertically, omnidirectional properties both as transmitters and receivers. All was enough to establish the best validity of the spiral shaped transducers for applications based on the bio sonar principle.

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