Title :
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
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;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991906
