Ultrasonic transducers with resonant cavities as emitters for air-borne applications
| Autor: | Octavio Manzanares, Alberto, Montero de Espinosa Freijo, Francisco |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Boletín de la Sociedad Española de Cerámica y Vidrio, Vol 48, Iss 4, Pp 205-210 (2009) Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0366-3175 |
| Popis: | In this work a new proposal to improve the emission efficiency of air-borne ultrasonic transducers is introduced. A theoretical ultrasonic transducer design is studied using a piezoelectric membrane and a Helmholtz resonator with two acoustic ports. The resonator provides radiation in the acoustic ports in phase with that of the membrane. Several finite element simulations and experimental results are used to study the device. The finite element models were used to compare its behaviour with that of conventional vacuum-cavity transducers. These results show an improvement in the bandwidth reaching a quality factor value of 19. Furthermore, the experimental measurements were used to study the effects of the resonant cavity in the response. Several measurements for different cavity depths were performed. The results show an improvement of 25 dB in the emitted pressure through tuning the transducer. |
| Databáze: | OpenAIRE |
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