| Literature DB >> 19213648 |
Qifa Zhou1, Jung Hyui Cha, Yuhong Huang, Rui Zhang, Wenwu Cao, K Kirk Shung.
Abstract
Mismatch of acoustic impedance at the interface between a piezoelectric transducer and the medium to be probed will substantially reduce the amount of ultrasound energy being transmitted into the medium. Therefore, matching layer is a critical component of an ultrasonic transducer. A spin-coating process was used to fabricate alumina/polymer nanocomposite films with alumina volume fractions ranging from 14 to 32%. The particle size of alumina is in the range of 10 to 40 nm. The thicknesses of the matching layer can be controlled by the spinning speed and the concentration of solution. Acoustic impedances of these nanocomposite matching layers are in the range of 2.8 to 5.1 MRayls with different alumina contents, which meet the matching layer requirement. The attenuation of a nanocomposite matching layer with smooth surface is about 15 dB/mm at 40 MHz. The pulse-echo spectrum and frequency spectrum of a high-frequency transducer using this nanocomposite matching layer are reported.Entities:
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Year: 2009 PMID： 19213648 PMCID： PMC2729565 DOI： 10.1109/TUFFC.2009.1021
Source DB: PubMed Journal: IEEE Trans Ultrason Ferroelectr Freq Control ISSN： 0885-3010 Impact factor: 2.725