Laboratoire de Géophysique Interne et Tectonophysique, Centre National de la Recherche Scientifique & Université J Fourier, Grenoble 38041, France.
J Acoust Soc Am. 2011 Apr;129(4):1963-71. doi: 10.1121/1.3557029.
Through experiments and simulations, the consequences of symmetry on coherent backscattering enhancement (CBE) are studied in cavities. Three main results are highlighted. First, the CBE outside the source is observed: (a) on a single symmetric point in a one-dimensional (1-D) cavity, in a disk and in a symmetric chaotic plate; (b) on three symmetric points in a two-dimensional (2-D) rectangle; and (c) on seven symmetric points in a three-dimensional (3-D) parallelepiped cavity. Second, the existence of enhanced intensity lines and planes in 2-D and 3-D simple-shape cavities is demonstrated. Third, it is shown how the anti-symmetry caused by the special boundary conditions is responsible for the existence of a coherent backscattering decrement with a dimensional dependence of R = (½)(d), with d = 1,2,3 as the dimensionality of the cavity.
通过实验和模拟，研究了腔中的对称对相干背散射增强（CBE）的影响。突出了三个主要结果。首先，观察到源外的 CBE：（a）在一维（1-D）腔、圆盘和对称混沌板中的单个对称点上；（b）在二维（2-D）矩形中的三个对称点上；和（c）在三维（3-D）平行六面体腔中的七个对称点上。其次，证明了二维和三维简单形状腔中增强强度线和平面的存在。第三，表明了特殊边界条件引起的反对称性如何导致相干背散射衰减的存在，其维度依赖性为 R = (½)(d)，其中 d = 1、2、3 分别为腔的维度。
