Super-resolution in time-reversal acoustics
Super-resolution in time-reversal acoustics
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DOI：
10.1121/1.1421342
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发表时间：
2002-01-01
影响因子：
2.4
通讯作者：
Zhao, HK
中科院分区：
文献类型：
--
作者：
Blomgren, P;Papanicolaou, G;Zhao, HK
从理论和数值模拟两方面分析了时间反演声学中的超分辨现象。一种信号，它被记录下来，然后由换能器阵列重新发射，通过介质传播回来，并重新聚焦到发射它的源上。在均匀介质中，时间反演信号的重新聚焦分辨率受到衍射的限制。当介质具有随机不均匀性时，重聚焦信号的分辨率在某些情况下可以超过衍射极限。这是超分辨率。给出了这种现象的理论处理，并提出了数值模拟，证实了理论。(C)2002年美国声学学会。
The phenomenon of super-resolution in time-reversal acoustics is analyzed theoretically and with numerical simulations. A signal that is recorded and then retransmitted by an array of transducers, propagates back though the medium, and refocuses approximately on the source that emitted it. In a homogeneous medium, the refocusing resolution of the time-reversed signal is limited by diffraction. When the medium has random inhomogeneities the resolution of the refocused signal can in some circumstances beat the diffraction limit. This is super-resolution. A theoretical treatment of this phenomenon is given, and numerical simulations which confirm the theory are presented. (C) 2002 Acoustical Society of America.