【摘要】 基于Khokhlov-Zabolotkaya-Kuznetsov(KZK)方程,在频域提出了聚焦超声波在层状生物媒质中传播的理论模型,该模型计及生物媒质的吸收、非线性和边界,同时考虑声源的衍射对声传播的影响.数值研究了聚焦超声波的基波和二次谐波在层状生物媒质中的声传播,并与实验结果相比较.研究结果表明,此方法可以有效地描述聚焦超声波在层状生物媒质中的二次谐波声场.更多还原

【Abstract】 Based on the Khokhlov-Zabolotkaya-Kuznetsov (KZK) equation in frequency-domain, a theoretical model of focused ultrasonic waves in the layered biological medium with consideration of the sound absorption, nonlinearity, boundary of the media and the diffraction of the source is presented. The propagation of focused ultrasonic waves for fundamental and second harmonic in the multi-layered biological media are numerically studied and compared with the experimental results. Good agreement of the theory with the measurement shows that this approach can effectively describe the second harmonic sound field in multi-layered biological media.更多还原