2008
EMSS 2008 Proceeding
Modeling and evaluation of distinct alternative designs for wide-band aircoupled piezoelectric transducers
Authors: Abelardo Ruíz Toledo, Tomas E. Gómez Álvarez-Arenas
Abstract
Air-coupled ultrasonic piezoelectric transducers have demonstrated their usefulness in several areas such as materials characterization, surface metrology, or NDE. Although sensitivity is good, their bandwidth is quite narrow. This can be improved by adding two or more matching layers. Usually, these layers become unpractical because they are either extremely thin, or light or brittle and such transducers have to be constructed using materials that are far from the ideal specifications. Here, a comprehensive modeling tool (PSPICE) for the design of air-coupled piezoelectric transducers with improved bandwidth, considering real and low attenuating materials is presented. Several characteristic broadband functions, were simulated in time-frequency domains, for selected sets of the piezoelectric and matching layer materials. Finally, the best transducer design considering real materials within the double-matching layer scheme is proposed. The analysis is restricted to transducers having a centre frequency at 1 MHz. The simulated transducer performance is compared with experimental data.
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