Spatial coherences of the sound pressure and the particle velocity in underwater ambient noise |
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作者姓名: | References: |
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作者单位: | Institute of Acoustics, The Chinese Academy of Sciences Beijing 100080 |
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摘 要: | The spatial coherences were investigated between the sound pressure and the three orthogonal components of the particle velocity in underwater ambient noise. Based on the ray theory, integral expression was derived for the spatial coherence matrix of the sound pressure and the particle velocity in a stratified ocean with dipole noise sources homogenously distributed on the surface. The integrand includes a multiplying factor of the vertical directivity of the noise intensity, and the layered ocean environment affects the spatial coherences via this directivity factor. For a shallow water environment and a semi-infinite homogenous medium, the coherence calculation results were given. It was showed that the sound speed profile and the sea bottom could not be neglected in determining the spatial coherences of the ambient noise vector field.
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关 键 词: | 空间相干性 声压 水下噪声 偶极 |
修稿时间: | 2006-03-032006-06-13 |
Spatial coherences of the sound pressure and the particle velocity in underwater ambient noise |
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Authors: | YAN Jin LUO Xianzhi HOU Chaohuan |
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Abstract: | The spatial coherences were investigated between the sound pressure and the three orthogonal components of the particle velocity in underwater ambient noise. Based on the ray theory, integral expression was derived for the spatial coherence matrix of the sound pressure and the particle velocity in a stratified ocean with dipole noise sources homogenously distributed on the surface. The integrand includes a multiplying factor of the vertical directivity of the noise intensity, and the layered ocean environment affects the spatial coherences via this directivity factor. For a shallow water environment and a semi-infinite homogenous medium, the coherence calculation results were given. It was showed that the sound speed profile and the sea bottom could not be neglected in determining the spatial coherences of the ambient noise vector field. |
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