柱面NAH中的采样间隔取值研究

目前柱面NAH的重建参数选取方面未见有专门分析,多数沿用平面NAH的选取原则,或作为平面NAH的延伸稍加讨论。但两者在算法实现等方面存在较大差异,应单独对其重建参数选取进行研究;该文系统分析了2种NAH在参数选择方面的不同之处,对柱面NAH中采样间隔的取值做了细致分析,并综合考虑了它与其它重建参数间的相互关系;在这些研究的基础上,给出了采样间隔在轴向和周向的取值范围,文中采用数值仿真验证了结论的正确性。

Research on sampling space of the cylindrical NAH

Currently there is no special analysis on the reconstruction parameters selection of the cylindrical near-field acoustic holography (NAH). The planar NAH method is commonly used, or the cylindrical NAH is just mentioned as the extension in planar NAH research. But great differences lie between the planar NAH and the cylindrical NAH. And the reconstruction parameters of the cylindrical NAH should be researched separately. By analyzing the difference between the two kinds of NAH in regard of the parameter selection, and the paper focuses on the sampling space of the cylindrical NAH and its relationship to other sampling spaces. Furthermore, the sampling space range at axial and circle directions are given. The validity of the proposed research is proved by the numerical simulations.