| 许小芳,周红生,杨红穗,刘春泽.超声造影剂微泡非线性声学特性的数值仿真[J].声学技术,2015,34(6):521~524 |
| 超声造影剂微泡非线性声学特性的数值仿真 |
| Numerical simulation on the nonlinear acoustic characteristics of ultrasonic contrast-agent |
| 投稿时间：2015-08-11 修订日期：2015-11-14 |
| DOI：10.16300/j.cnki.1000-3630.2015.06.010 |
| 中文关键词: 超声造影剂 非线性声学特性 基波 二次谐波 |
| 英文关键词: ultrasonic contrast agent nonlinear acoustic properties fundamental second harmonics. |
| 基金项目:国家自然科学基金项目(11274342、11304353、11474042、11574348) |
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| 中文摘要: |
| 以空气泡为例,采用描述气泡半径运动的Rayleigh-Plesset方程,对其在高频声压辐照下的非线性振荡,散射声场和散射截面进行理论和数值研究,为获取更清晰的图像提供理论依据。结果表明:激励声压的频率在微泡的固有谐振频率附近时,可以产生强的二次谐波散射声压。同时,提高入射声强可以增大二次谐波散射截面,但不能改变基波散射截面。 |
| 英文摘要: |
| Aimed to provide theoretical basis for acquiring more distinct images, some theoretical and numerical research on nonlinear vibration, scattering acoustic field and scattering cross section of bubbles under high frequency acoustic radiation have been done based on the Rayleigh-Plesset equation describing bubbles' radius movement. The simulations show that strong secondary harmonic scattering acoustic pressure can be obtained when the frequency of driven acoustic pressure is near bubbles' inherent frequency, while higher incident acoustic pressure can increase secondary harmonic scattering cross section rather than fundamental wave scattering cross section. |
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