Drastic hardware simplification and cost reduction of Guided Wave (GW) based systems can be achieved by using piezoelectric transducers that, shaped according to a frequency based beam steering concept, present inherent directional capabilities exhibiting preferential radiation/sensing directions. In particular, directional GWs generation and sensing can be achieved by patterning the piezoelectric material lay-out and the electrodes. Frequency steerable acoustic transducers (FSATs) peculiar electrodes' shape produces a spatial filtering effect which is frequency-dependent, so that a direct relationship can be established between the direction of propagation (wavenumber) and the spectral content of the transmitted/received signal. In this paper we present a novel design strategy of FSAT that enables enhanced sensor directivity by using a local variation of the density of the piezoelectric material.
A design strategy to improve the directivity of wavenumber-spiral frequency-steerable acoustic transducers / De Marchi, Luca; Testoni, Nicola; Marzani, Alessandro. - STAMPA. - 2:(2015), pp. 907-913. (Intervento presentato al convegno 10th International Workshop on Structural Health Monitoring: System Reliability for Verification and Implementation, IWSHM 2015 tenutosi a Stanford University, usa nel 2015).
A design strategy to improve the directivity of wavenumber-spiral frequency-steerable acoustic transducers
DE MARCHI, LUCA;TESTONI, NICOLA;MARZANI, ALESSANDRO
2015
Abstract
Drastic hardware simplification and cost reduction of Guided Wave (GW) based systems can be achieved by using piezoelectric transducers that, shaped according to a frequency based beam steering concept, present inherent directional capabilities exhibiting preferential radiation/sensing directions. In particular, directional GWs generation and sensing can be achieved by patterning the piezoelectric material lay-out and the electrodes. Frequency steerable acoustic transducers (FSATs) peculiar electrodes' shape produces a spatial filtering effect which is frequency-dependent, so that a direct relationship can be established between the direction of propagation (wavenumber) and the spectral content of the transmitted/received signal. In this paper we present a novel design strategy of FSAT that enables enhanced sensor directivity by using a local variation of the density of the piezoelectric material.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
