Title :
Materials for acoustic matching in ultrasound transducers
Author :
Rhee, S. ; Ritter, T.A. ; Shung, K.K. ; Wang, H. ; Cao, W.
Author_Institution :
NIH Resource Center on Med. Ultrasonic Transducer Technol., Pennsylvania State Univ., University Park, PA, USA
Abstract :
Acoustic impedance (Z) and fabrication issues for matching layers in high frequency transducers were identified. Guided by a density/impedance relationship established for various polymers, glasses, ceramics and metals, few monolithic materials with Z in the range of 6-9 MRayls were found. Composites of gold- and silver-polymer resulted in the desired impedances, however, with increased attenuation. Issues of microstructural scale, homogeneity and particle size effects were noted including issues of percolation behaviour for conducting composites. Using PiezoCad, the effect of matching layer thickness and impedance variation of a 100 MHz transducer were modeled
Keywords :
acoustic impedance; particle size; percolation; ultrasonic transducers; 100 MHz; Ag-polymer; Au-polymer; PiezoCad; US transducers; acoustic impedance; conducting composites; density/impedance relationship; high frequency transducers; homogeneity; matching layer impedance variation; matching layer thickness; matching layers; microstructural scale; particle size effects; percolation behaviour; Acoustic materials; Acoustic transducers; Ceramics; Fabrication; Frequency; Glass; Impedance; Polymers; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991900
