Remote measurement of material properties from radiation force induced vibration of an embedded sphere
Remote measurement of material properties from radiation force induced vibration of an embedded sphere
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DOI：
10.1121/1.1501276
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发表时间：
2002-09-01
影响因子：
2.4
通讯作者：
Greenleaf, JF
中科院分区：
文献类型：
--
作者：
Chen, SG;Fatemi, M;Greenleaf, JF
提出了由频率为 omega(1) 和 omega(2) 的两个超声波束振动的球体的定量模型。由于两束声束的干涉，辐射力具有频率为 omega(2) - omega(1) 的动态分量。然后使用球体的辐射阻抗和机械阻抗来计算球体的振动速度。通过激光振动计在水中和凝胶体模中的多个球体上测量振动速度与振动频率。这些实验结果用于验证模型。该方法可用于估计球体周围介质的材料特性（例如剪切模量）。 (C) 2002 年美国声学学会。
A quantitative model is presented for a sphere vibrated by two ultrasound beams of frequency omega(1) and omega(2). Due to the interference of two sound beams, the radiation force has a dynamic component of frequency omega(2) - omega(1). The radiation impedance and mechanical impedance of the sphere are then used to compute the vibration speed of the sphere. Vibration speed versus vibration frequency is measured by laser vibrometer on several spheres, both in water and in gel phantom. These experimental results are used to verify the model. This method can be used to estimate the material properties of the medium (e.g., shear modulus) surrounding the sphere. (C) 2002 Acoustical Society of America.