【摘要】：以空氣泡為例,采用描述氣泡半徑運動的Rayleigh-Plesset方程,對其在高頻聲壓輻照下的非線性振蕩,散射聲場和散射截面進行理論和數(shù)值研究,為獲取更清晰的圖像提供理論依據(jù)。結(jié)果表明:激勵聲壓的頻率在微泡的固有諧振頻率附近時,可以產(chǎn)生強的二次諧波散射聲壓。同時,提高入射聲強可以增大二次諧波散射截面,但不能改變基波散射截面。
[Abstract]:Taking air bubble as an example, the Rayleigh-Plesset equation describing the motion of bubble radius is used to study the nonlinear oscillation, scattered sound field and scattering cross section under high frequency sound pressure irradiation, which provides a theoretical basis for obtaining a clearer image. The results show that strong second harmonic scattering sound pressure can be produced when the frequency of excited sound pressure is near the inherent resonance frequency of microbubble. At the same time, the second harmonic scattering cross section can be increased by increasing the incident sound intensity, but the fundamental wave scattering cross section can not be changed.
【作者單位】： 中國科學(xué)院聲學(xué)研究所東海研究站;
【基金】：國家自然科學(xué)基金項目(11274342;11304353;11474042;11574348)
【分類號】：R445.1;O426.9

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