Alumina/Epoxy Nanocomposite Matching Layers for High-Frequency Ultrasound Transducer Application

作者：Zhou Qifa^*; Cha Jung Hyui; Huang Yuhong; Zhang Rui; Cao Wenwu; Shung K Kirk

来源：IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2009, 56(1): 213-219.

DOI：10.1109/TUFFC.2009.1021

Mismatch of acoustic impedance at the interface between a piezoelectric transducer and the medium to he probed will substantially reduce the amount of ultrasound energy being transmitted into the medium. Therefore, matching layer is a critical component of air 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 tire range of 10 to 40 nm. The thicknesses of the matching layer can be controlled trolled 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, Hie 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.

• 出版日期2009-1