Weaver RL, Lobkis OI
Department of Theoretical and Applied Mechanics, University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2000 May 22;84(21):4942-5. doi: 10.1103/PhysRevLett.84.4942.
We report experimental evidence for coherent backscattering of waves in a three-dimensional elastic body. Ultrasonic spectral energy density consequent to a transient excitation is measured as a function of time and of distance from the source. In accord with the predictions of random matrix theory, an enhancement is found near the source by a weak localization factor of 2 at early times, but a factor of 3 at late times. The effect appears to be independent of absorption.
我们报告了三维弹性体中波的相干背散射的实验证据。测量了瞬态激发后超声频谱能量密度随时间和距源距离的变化。与随机矩阵理论的预测一致，在早期，源附近发现增强，弱局域化因子为2，但在后期为3。该效应似乎与吸收无关。
