A spectral approach to 3-D object scattering in layered media applied to scattering from submerged spheres
A spectral approach to 3-D object scattering in layered media applied to scattering from submerged spheres
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DOI：
10.1121/1.423724
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发表时间：
1998-10
影响因子：
2.4
通讯作者：
N. Makris
中科院分区：
文献类型：
--
作者：
N. Makris
本文给出了分层媒质中三维目标散射的谱公式。当源和接收器离物体足够远时，该公式是有效的，物体和波导边界之间的多次散射可以忽略不计，并且散射场可以表示为物体的平面波散射函数的线性函数。然后推导了分层介质中球形目标散射场的解析表达式。由于表达式是在1-D波数积分方面，它是计算效率高的实施，允许详细调查的散射场附近的对象，并使渐逝波的散射被纳入解析延拓。对非紧球（1<ka）的计算说明了浅多模波导中三维目标散射的基本特性。相对于自由空间散射，在前向散射场的水平显着下降…
A spectral formulation for 3-D object scattering in a layered medium is described. The formulation is valid when the source and receiver are sufficiently far from the object that multiple scattering between the object and waveguide boundaries can be neglected and the scattered field can be expressed as a linear function of the object’s plane wave scattering function. An analytic expression is then derived for the field scattered from a spherical object in a stratified medium. Since the expression is in terms of 1-D wave number integrals, it is computationally efficient to implement, allows detailed investigation of the scattered field in the vicinity of the object, and enables scattering of evanescent waves to be incorporated by analytic continuation. Computations for a noncompact sphere (1<ka) illustrate the essential characteristics of 3-D object scattering in a shallow but multi-modal waveguide. Relative to free-space scattering, a significant decrease in the level of the scattered field in the forward...