近场声全息方法研究目标散射场

将ＮＡＩ方法应用散射问题研究，由散射体近场全息图面上的复声压数据重建模射体表面的散射场，并进一步预报远场攻射声指向性，对于平面波入射下刚硬球的散射情况作了数值模拟，模拟结果与理论计算吻合较好，显示了ＮＡＨ方法应用于目标表面散射特性和远场声场特性的研究的可行性。

Investigation of target scattered field by NAH

The near-field acoustic holography (NAH) technique is applied to acoustic scatter problems.The scattered field on the scatter's surface is reconstructed from the complex pressure data on the hologram that is in the neighbourhood of the scatter.Then the far-field scattered sound directivity is predicted.As a numerical simulation example,a rigid spherical scatter with a plane incidence is studied.The coincidence between the numerical results and analytical results shows that NAH is applicable to the investigation on the scatter characteristics on the surface of target and far-field characteristics.