A study on the focusing property of time reversal waves in shallow water
A study on the focusing property of time reversal waves in shallow water
复制标题
浅水区时间反演波聚焦特性研究
DOI：
10.1250/ast.25.364
复制
发表时间：
2004
影响因子：
0.7
通讯作者：
T. Shimura
中科院分区：
文献类型：
--
作者：
T. Shimura
基于简正模态方法的模拟，讨论了浅水或深海时间反演波（相位共轭波）的聚焦特性。本研究通过水槽实验验证了时间反演波的聚焦特性，得出时间反演波能够使声波会聚到焦点的结论。此外，模拟结果与实验结果定性一致。这项研究还研究了时间反转镜（TRM）阵列的元件配置如何影响聚焦特性，并澄清了以下问题：当TRM阵列中的元件数量减少时，焦点处接收的信号不会受到干扰。即使 TRM 阵列倾斜或其元件的高度稳定移动，焦点处接收到的信号也不会受到干扰。然而，如果倾斜或高度移动不是静止的，时间反转波就会失去其聚焦特性。即使是水平 TRM 阵列，如果长度足够，也可以产生时间反转波。
The focusing property of time reversal waves (phase conjugate waves) in shallow water or the deep sea has been discussed based on simulations of the normal mode method. In this study, the focusing property of time reversal waves was verified through tank experiments and it was concluded that time reversal waves enable acoustic waves to be converged to the focus. Further, the simulation results qualitatively concurred with the experimental results. This study also investigated how the configuration of the elements of the Time Reversal Mirror (TRM) array affects the focusing property, and the following matters were clarified: The signal received at the focus is not disrupted when the number of elements in the TRM array is reduced. Even if the TRM array is tilted or the heights of its elements are steadily shifted, the signal received at the focus is not disrupted. However, if the tilting or the height-shifting is not stationary, the time reversal waves lose their focusing property. Even a horizontal TRM array can generate time reversal waves if it is of adequate length.