Theoretical and experimental investigation of the pulse-echo nonlinearity acoustic sound fields of focused transducers
Theoretical and experimental investigation of the pulse-echo nonlinearity acoustic sound fields of focused transducers
复制标题
聚焦换能器脉冲回波非线性声场的理论与实验研究
DOI：
10.1016/j.apacoust.2016.10.015
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发表时间：
2017-02-01
影响因子：
3.4
通讯作者：
Hu, Hongwei
中科院分区：
文献类型：
--
作者：
Zhang, Shuzeng;Li, Xiongbing;Hu, Hongwei
对聚焦换能器产生的脉冲回波非线性声波场进行了数值计算和实验验证。仿真结果表明，在反射方向上，无论刚性边界和无应力边界如何，新产生的二次谐波与反射波的相位差约为pi/2；因此，总二次谐波既不会被强烈增强，也不会被抵消。用聚焦换能器在脉冲回波模式下进行了实验，测得的水-空气和水-铝/钢界面后反射的非线性波幅值与模拟结果吻合。这项工作有助于推进脉冲回波非线性声学的应用。(C) 2016 Elsevier Ltd.版权所有。
The pulse-echo nonlinear acoustic wave fields generated by focused transducers are calculated numerically and verified experimentally. Simulation results show that in the reflection direction, phase differences between newly generated second harmonic and reflected waves are about pi/2, regardless of the rigid and stress-free boundaries; thus, the total second harmonic wave will neither be strongly enhanced nor be cancelled. Experiments are conducted with a focused transducer working in pulse-echo mode and the measured amplitudes of nonlinear waves reflected after water-air and water-aluminum/steel interfaces agree with the simulated results. This work helps advance applications using pulse-echo nonlinear acoustics. (C) 2016 Elsevier Ltd. All rights reserved.