三维强散射介质中超声的动态相干后向散射
Dynamic coherent backscattering of ultrasound in three-dimensional strongly-scattering media
摘要：
我们提出了测量的扩散系数的超声在强散射三维（3D）无序介质使用动态相干背散射（CBS）效应。我们的实验测量的CBS的超声波使用的换能器阵列放置在远场的三维板样品的钎焊铝珠包围真空。我们扩展到3D介质的CBS，最初开发的声波在2D的一般微观理论。这个理论是有效的，在强散射，但仍然弥漫，制度，实现在我们的样品，并在我们的实验中遇到的扩散远场极限进行评估。通过比较我们的理论与实验数据，我们得到了一个准确的测量超声波在我们的样品中的扩散系数。我们发现，$D$的值是相当小的，$0.74 \pm 0.03$ mm $^2/μ$ s，并评论这种慢传输的能量速度的影响。
英文摘要：
We present measurements of the diffusion coefficient of ultrasound in strongly scattering three-dimensional (3D) disordered media using the dynamic coherent backscattering (CBS) effect. Our experiments measure the CBS of ultrasonic waves using a transducer array placed in the far-field of a 3D slab sample of brazed aluminum beads surrounded by vacuum. We extend to 3D media the general microscopic theory of CBS that was developed initially for acoustic waves in 2D. This theory is valid in the strong scattering, but still diffuse, regime that is realized in our sample, and is evaluated in the diffuse far field limit encountered in our experiments. By comparing our theory with the experimental data, we obtain an accurate measurement of the diffusion coefficient of ultrasound in our sample. We find that the value of $D$ is quite small, $0.74 \pm 0.03$ mm$^2/μ$s, and comment on the implications of this slow transport for the energy velocity.
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