A new ultrasonic transducer operating in air and fabricated by thick film technology is presented. It consists of a composite mechanical structure in which three active elements, made with planar alumina substrates supporting PZT-based piezoelectric films, behave as elastic guides. The active elements have a constant rectangular cross-section and are radially placed, 120 degrees apart. They are mounted between a rigid base (operating as the acoustic backing) and an alumina disk. On both sides of each substrate a piezoelectric layer las interdigital thick-film electrodes embedded in layer itself, so that it can be polarized parallel to the long side of the active element; consequently, it allows the creation of periodic surface stresses responsible for symmetric extensional strains in the alumina plates. The elements, synchronously driven in phase, form, with the disk, a vibrating resonant structure, which radiates acoustic energy perpendicular to the disk surface. The assembly of active elements, acoustic backing and radiating disk forms a composite ultrasonic transducer operating in air without the need of any acoustic matching layer. Among the prominent features offered by the transducer design are: a transduction efficiency of 25% at an exiting voltage of 100 V-p and a high directivity of the emitted beam.
A new ultrasonic composite transducer implemented with thick film technology / Decicco, G; Morten, Bruno; Prudenziati, Maria. - In: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL. - ISSN 0885-3010. - STAMPA. - 44(1997), pp. 992-996.
Data di pubblicazione: | 1997 | |
Titolo: | A new ultrasonic composite transducer implemented with thick film technology | |
Autore/i: | Decicco, G; Morten, Bruno; Prudenziati, Maria | |
Autore/i UNIMORE: | ||
Rivista: | ||
Volume: | 44 | |
Pagina iniziale: | 992 | |
Pagina finale: | 996 | |
Codice identificativo ISI: | WOS:A1997XV18900006 | |
Codice identificativo Scopus: | 2-s2.0-0031232590 | |
Citazione: | A new ultrasonic composite transducer implemented with thick film technology / Decicco, G; Morten, Bruno; Prudenziati, Maria. - In: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL. - ISSN 0885-3010. - STAMPA. - 44(1997), pp. 992-996. | |
Tipologia | Articolo su rivista |
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