A time-reversal mirror with variable range focusing
A time-reversal mirror with variable range focusing
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DOI：
10.1121/1.421914
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发表时间：
1998-05
影响因子：
2.4
通讯作者：
Hee-Chun Song;W. Kuperman;W. Hodgkiss
中科院分区：
文献类型：
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作者：
Hee-Chun Song;W. Kuperman;W. Hodgkiss
最近在地中海进行的时间反转镜（TRM）实验证明了在浅水波导中使用频率范围不变特性的可变范围聚焦[Song等人，J. Acoust.美国社会102，3171（A）（1997）]。该技术涉及以几乎真实的时间方式根据焦距的期望变化以偏移的频率重新传输数据。与可变范围聚焦相反，似乎没有用于可变深度聚焦的环境独立的优雅解决方案。然而，基于环境知识的方法（其转化为能够计算声学模态结构）允许焦深移位。该方法涉及到投影出的重要模式接收的垂直源接收阵列（SRA）和适当地改变其激励聚焦在另一个深度。在1997年5月的实验中，一些有限的结果表明，这种方法是可行的。将提出并讨论与模拟和理论分析的数据比较。[Work由ONR支持。
Recent time‐reversal mirror (TRM) experiments conducted in the Mediterranean Sea demonstrated variable range focusing using the frequency‐range invariant property in a shallow‐water waveguide [Song et al., J. Acoust. Soc. Am. 102, 3171(A) (1997)]. The technique involves retransmitting the data at a shifted frequency according to the desired change in focal range in almost real‐time fashion. As opposed to the variable range focusing, there does not appear to be an environmentally independent elegant solution for variable depth focusing. However, a method based on knowledge of the environment, which translates to being able to compute the acoustic modal structure, permits a focal depth shift. The method involves projecting out the important modes received at the vertical source–receive array (SRA) and appropriately altering their excitation to focus at another depth. In the May 1997 experiment, some limited results demonstrated that this method is feasible. Comparison of data with simulations and theoretical analysis will be presented and discussed. [Work supported by ONR.]