A Low Frequency Broadband Flextensional Ultrasonic Transducer Array
| Autor: | Barbara Mauti, Alessandro Stuart Savoia, Giosue Caliano |
|---|---|
| Přispěvatelé: | Savoia, ALESSANDRO STUART, Mauti, Barbara, Caliano, Giosue' |
| Rok vydání: | 2015 |
| Předmět: |
Wire bonding
Fabrication Materials science Acoustics and Ultrasonics Acoustics Mechanical impedance 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity Transducer 0103 physical sciences Array data structure Ultrasonic sensor Electrical and Electronic Engineering 0210 nano-technology 010301 acoustics Instrumentation Electrical impedance |
| Zdroj: | IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 63(1) |
| ISSN: | 1525-8955 |
| Popis: | In this paper, we propose the design and the fabrication of a multicell, piezoelectrically actuated, flextensional transducer array structure, characterized by a low mechanical impedance, thus allowing wideband and high-sensitivity immersion operation in the low ultrasonic frequency range. The transducer structure, consisting of a plurality of circular elementary cells orderly arranged according to a periodic hexagonal tiling, features a high flexibility in the definition of the active area shape and size. We investigate, by finite element modeling (FEM), the influence of different piezoelectric and elastic materials for the flexural plate, for the plate support and for the backing, on the transducer electroacoustic behavior. We carry out the dimensioning of the transducer components and cell layout, in terms of materials and geometry, respectively, by aiming at a circular active area of 80-mm diameter and broadband operation in the 30–100-kHz frequency range in immersion. PZT-5H ceramic disks and a calibrated thickness stainless steel plate are chosen for the vibrating structure, and FR-4 laminates and a brass plate, respectively, for the plate support and the backing. The diameter of the individual cells is set to 6 mm resulting in 121 cells describing a quasi-circular area, and the total thickness of the transducer is less than 10 mm. We report on the fabrication process flow for the accurate assembly of the transducer, based, respectively, on epoxy resin and wire bonding for the mechanical and electrical interconnection of the individual parts. The results of the electrical impedance and transmit pressure field characterization are finally reported and discussed. |
| Databáze: | OpenAIRE |
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