Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles
YU Jin-Fei1, ZHANG Dong1, GONG Xiu-Fen1, GONG Yan-Jun1, ZHU Zhe-Min1, LIU Xue-Ming2
1State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093
2Second Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang 310009
Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles
1State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093
2Second Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang 310009
Abstract： Frequency dependences of the sound attenuation and phase velocity in an encapsulated bubbly liquid, such as ultrasound contrast agent or LevovistR suspensions, at three different concentrations are studied over a bandwidth 1.5--4.5MHz by using an ultrasonic spectroscopy technique. Measurement of acoustic attenuation spectra demonstrates that the resonant frequency of the LevovistR suspension is nearly 2.3--2.5MHz, and the sound attenuation enhances with the increasing concentration. With the measured sound attenuation spectra, the shear modulus and the shear viscosity are estimated to be 80Mpa and 1.3Pas, respectively. The phase velocity exhibits a rapid rise with frequency smaller than 3.0MHz, then appears to approach a frequency-independent limit above 3.0MHz, and the change of the phase velocity over the measured frequency range is also proportional to the concentration.
(Ultrasonics, quantum acoustics, and physical effects of sound)
引用本文:
YU Jin-Fei;ZHANG Dong;GONG Xiu-Fen;GONG Yan-Jun;ZHU Zhe-Min;LIU Xue-Ming. Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles[J]. 中国物理快报, 2005, 22(4): 892-895.
YU Jin-Fei, ZHANG Dong, GONG Xiu-Fen, GONG Yan-Jun, ZHU Zhe-Min, LIU Xue-Ming. Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles. Chin. Phys. Lett., 2005, 22(4): 892-895.
2005, Vol. 22 
