Ultrasonic pulse compression with one-bit time reversal through multiple scattering
Ultrasonic pulse compression with one-bit time reversal through multiple scattering
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DOI：
10.1063/1.370136
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发表时间：
1999-05-01
影响因子：
3.2
通讯作者：
Fink, M
中科院分区：
文献类型：
--
作者：
Derode, A;Tourin, A;Fink, M
我们给出的实验结果表明，即使通过高阶多次散射，也可以实现比特时间反转。一个短的超声波脉冲通过一组随机的钢棒进行传输和传播。散射波被记录在128通道阵列上，时间反转，并通过相同的介质重新传输。时间反转镜利用多重散射将散射波压缩成脉冲并将其聚焦回源。矛盾的是，我们表明，当分散的信号被数字化超过一个比特时，结果甚至更好。在时间和空间分辨率不变的情况下，压缩脉冲放大了12 dB，信噪比降低了1.2 dB。建立了一个统计模型，其预测结果与实验结果吻合较好。(C) 1999年美国物理研究所。[s0021 - 8979 (99) 08809 - x)。
We present experimental results that demonstrate the feasibility of one-bit time reversal even through high-order multiple scattering. A short ultrasonic pulse is transmitted and propagates through a random set of steel rods. The scattered waves are recorded on a 128-channel array, time reversed, and retransmitted through the same medium. The time-reversal mirror takes advantage of multiple scattering to compress the scattered waves into a pulse and focus it back onto the source. Paradoxically, we show that the results are even better when the scattered signals are digitized over one bit. Both temporal and spatial resolutions remain unchanged, while the compressed pulse is amplified by 12 dB, and the signal-to-noise ratio is lowered by 1.2 dB. A statistical model is developed, and its predictions are found to be in good agreement with the experimental results. (C) 1999 American Institute of Physics. [S0021-8979(99)08809-X].