Low-impedance and low-loss customized materials for air-coupled piezoelectric transducers

Author

Gómez, Tomás E. ; De Espinosa, Francisco Montero ; Moner-Girona, M. ; Rodríguez, E. ; Roig, A. ; Molins, E. ; Rodríguez, J.R. ; Vargas, S. ; Esteves, M.

Author_Institution

Inst. de Acustica, CSIC, Madrid, Spain

Volume

2

fYear

2001

fDate

2001

Firstpage

1077

Abstract

For efficient operation of air-coupled piezoelectric transducers (frequency >0.5 MHz) new materials to produce quarter-wavelength matching layers are required. Low acoustic impedance, low attenuation coefficients and the possibility to produce thin membranes attachable to the transducer surface are the main requirements. Two candidate-materials were selected, manufactured and characterized: SiO ₂ aerogel and highly porous PMMA. From the obtained results the suitability of such materials for this particular application is discussed and compared with other materials currently in use

Keywords

acoustic impedance; aerogels; dielectric losses; piezoelectric materials; piezoelectric transducers; porous materials; ultrasonic transducers; PMMA; acoustic impedance; aerogel; air-coupled piezoelectric transducers; attenuation coefficients; low-impedance materials; low-loss materials; porous materials; quarter-wavelength matching layers; transducer surface; Acoustic materials; Acoustic transducers; Attenuation; Biomembranes; Ethanol; Frequency; Piezoelectric materials; Piezoelectric transducers; Silicon compounds; Surface impedance;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2001 IEEE

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-7177-1

Type

conf

DOI

10.1109/ULTSYM.2001.991906

Filename

991906