High-frequency backscattering enhancements by thick finite cylindrical shells in water at oblique incidence: Experiments, interpretation, and calculations
High-frequency backscattering enhancements by thick finite cylindrical shells in water at oblique incidence: Experiments, interpretation, and calculations
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DOI：
10.1121/1.421200
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发表时间：
1998-08
影响因子：
2.4
通讯作者：
S. Morse;P. Marston;G. Kaduchak
中科院分区：
文献类型：
--
作者：
S. Morse;P. Marston;G. Kaduchak
脉冲响应后向散射测量和解释的倾斜入射平面波的散射充满空气的有限长圆柱壳浸没在水中。进行了测量，以确定在大倾角的厚壳的后向散射显着增强的条件。研究的壳体由不锈钢制成，细长，厚度与半径之比为7.6%和16.3%。的宽带PVDF（聚偏氟乙烯）片源被用来获得后向散射光谱幅度作为倾斜角（从宽边入射测量）的函数的气缸。将结果绘制为频率和角度的函数。这些图揭示了大的后向散射增强与弹性激发在高倾斜角，延伸到终端的重合频率区域中的入射。基于完全弹性理论和有限长圆柱壳的近似计算也具有类似的特点。
Impulse response backscattering measurements are presented and interpreted for the scattering of obliquely incident plane waves by air-filled finite cylindrical shells immersed in water. The measurements were carried out to determine the conditions for significant enhancements of the backscattering by thick shells at large tilt angles. The shells investigated are made of stainless steel and are slender and have thickness to radius ratios of 7.6% and 16.3%. A broadband PVDF (polyvinylidene fluoride) sheet source is used to obtain the backscattering spectral magnitude as a function of the tilt angle (measured from broadside incidence) of the cylinder. Results are plotted as a function of frequency and angle. These plots reveal large backscattering enhancements associated with elastic excitations at high tilt angles, which extend to end-on incidence in the coincidence frequency region. Similar features are present in approximate calculations for finite cylindrical shells based on full elasticity theory and t...