Subcritical penetration into rough seafloors due to Bragg scattering.
Subcritical penetration into rough seafloors due to Bragg scattering.
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DOI：
10.1121/1.4809683
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Linhui Peng;Gaokun Yu
中科院分区：
文献类型：
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作者：
Linhui Peng;Gaokun Yu
通过水槽实验和理论分析，研究了周期为0.3 m、振幅为2 cm的水与沙之间的正弦表面声Bragg散射。穿透场测量在20至40千赫的频率范围内，在槽内的掠角为10°至90°。为解释实验中观察到的干涉图样，导出了正弦表面声散射的理论解。结果表明，负一阶布拉格散射波的强度足以干扰符合斯涅尔定律的折射波，形成可以实验检测到的干涉图样。
A tank experiment and theoretical analysis are carried out to study acoustic Bragg scattering by a sinusoidal surface with period 0.3 m and amplitude 2 cm between water and sand sediment. The penetrating field is measured in the frequency range from 20 to 40 kHz at grazing angles 10° to 90° in the tank. A theoretical solution for acoustic scattering by the sinusoidal surface is derived to explain the interference pattern observed in the experiment. The result shows that the minus first order Bragg scattering wave is strong enough to interfere with the refracted wave obeying Snell's law, forming interference patterns that can be detected experimentally.