Geophysics Group EES-17, MS D443, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
J Acoust Soc Am. 2011 Oct;130(4):EL258-63. doi: 10.1121/1.3638926.
A nonlinear scatterer is simulated in the body of a sample and demonstrates a technique to locate and define the elastic nature of the scatterer. Using the principle of time reversal, elastic wave energy is focused at the interface between blocks of optical grade glass and aluminum. Focusing of energy at the interface creates nonlinear wave scattering that can be detected on the sample perimeter with time-reversal mirror elements. The nonlinearly generated scattered signal is bandpass filtered about the nonlinearly generated components, time reversed and broadcast from the same mirror elements, and the signal is focused at the scattering location on the interface.
在样本体中模拟非线性散射体，并展示一种定位和定义散射体弹性性质的技术。利用时间反转原理，弹性波能量聚焦在光学级玻璃和铝块之间的界面上。能量在界面上的聚焦会产生非线性波散射，可以在样品周边用时间反转镜元件检测到。从相同的镜元件中广播非线性产生的散射信号，对非线性产生的分量进行带通滤波、时间反转，并从相同的镜元件中广播，信号在界面的散射位置聚焦。
