Mode excitation and imaging by the radiation force of ultrasound
Mode excitation and imaging by the radiation force of ultrasound
复制标题
超声辐射力的模式激发和成像
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Zeraati
中科院分区：
文献类型：
--
作者：
M. Fatemi;M. Zeraati
介绍了一种非接触激励和显示固体振型的方法。该方法利用调幅聚焦超声的辐射力远程激发物体中的共振模式。超声换能器由正弦调制的连续波信号驱动，以在物体上产生振荡辐射力，并将其驱动到其自然共振模式之一。利用水听器探测物体振动产生的声场。建立了描述力、振型和声场之间关系的理论模型。结果表明，声场幅值与声束焦点处的振型成正比。通过扫描穿过对象的超声束，可以将声学数据映射到表示对象的模式形状的图像中。已经在钢梁、铝梁和玻璃梁上进行了实验。前五个共鸣...
A method for noncontact excitation and displaying the vibration mode shapes in solids is introduced. This method utilizes the radiation force of amplitude‐modulated focused ultrasound to remotely excite a resonant mode in the object. The ultrasound transducer is driven by a sinusoidally modulated continuous wave signal to produce an oscillatory radiation force on the object and drive it into one of its natural resonance modes. The acoustic field resulting from object vibration is detected by a hydrophone. A theoretical model has been developed that describes the relationship between the force, mode shape, and the acoustic field. It is shown that the acoustic field amplitude is proportional to the value of the mode shape at the focal point of the ultrasound beam. By scanning the ultrasound beam across the object it is possible to map the acoustic data into an image that represents the mode shape of the object. Experiments have been conducted on small steel, aluminum, and glass beams. The first five resonan...