Ultrasonic Transducers Shaped in Archimedean and Fibonacci Spiral: A Comparison

Sensors

MariaGiovanna Bianco¹  AntoninoS. Fiorillo¹  CostantinoDavide Critello¹  SalvatoreAndrea Pullano¹ 

[1] BATS Lab, Department of Health Sciences, University “Magna Graecia” of Catanzaro, 88100 Catanzaro, Italy;

关键词: Archimedean spiral;    ferroelectric polymer;    Fibonacci spiral;    piezoelectricity;    cochlea;    ultrasonic transducers bio sonar;   

DOI  :  10.3390/s20102800

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown